Map field default location in clonable group....via AJAX?

Another possibility would be to add to an existing form submission post. ie map for one paddock submits; subsequent paddocks retrieve default Zoom and Location from the submission CPT Location field.

... does that make sense?

No I think you're not understanding. The user would need to input multiple markers on a map - I don't believe that's possible.

I should theoretically be able add multiple maps to a single submission if I set the form to 'edit' => true. The newly created submission post could store the co-ordinates and set that as the default for subsequent map additions. Unfortunately the documentation on this is extremely poor so incredibly difficult to work out how to do it. https://docs.metabox.io/extensions/mb-frontend-submission/

If I set edit to true it returns a blank page on submission. How do I set the redirect to view the newly created submission post?

My code looks like this:

add_filter( 'rwmb_meta_boxes', function ( $meta_boxes ) {

	$meta_boxes[] = array (
		'title' => 'Submit Paddock',
		'id' => 'submit_paddock_form_vic',
        'post_types' => 'eoi',
        'edit' => true,
        'validation'    =>  [
            'rules' =>  [
                            'phone' => [
                                        'required' => true,
                                        ],
                            'full_name' => [
                                        'required' => true,
                                        ],
                            'email' => [
                                        'required' => true,
                                        ],
                        ]

        ],
		'fields' => [
            [
                'id'    =>  'recipients',
                'type'  =>  'hidden',
                'std'  => '[email protected],[email protected]',
                'std'  => '[email protected]',
            ],
            [
                'name'  =>  'Full Name',
                'id'    =>  'full_name',
                'type'  => 'text',
            ],
            [
                'name'  =>  'Contact Phone',
                'id'    =>  'phone',
                'type'  => 'text',
            ],
            [
                'name'  =>  'Contact Email',
                'id'    =>  'email',
                'type'  => 'text',
            ],
            [
                'name'  =>  'NGR',
                'id'    =>  'ngr',
                'type'  => 'text',
            ],
            [
                // 'name'   => 'Add a paddock', 
                'id'     => 'paddock_group',
                'type'   => 'group',
                'clone'  => true,
                'collapsible' => true,          // Column size (1-12)
                'class' => 'paddock_picker',
                'group_title' => 'Paddock {#}',
                'group_title' => ['field' => 'paddock_name'],
                'add_button' => '+ Add a paddock',
                'fields' => [

                                [
                                    'name'  =>  'Paddock Location',
                                    'id'    =>  'paddock_location',
                                    'desc'  =>  'Select the satellite view then drag the marker whilst zooming in to locate your paddock.',
                                    'type'  => 'map',
                                    'api_key'   => 'AIzaSyBUtodUtVKW1VJa9Gmzz2-VuQuwd7A7GLQ',
                                    'std'   => '-35.3453808,143.5625836,7',
                                    'clone_default' => true,
                                    'js_options' => [
                                        'mapTypeId'   => 'SATELLITE',
                                    ],
                                ],
                                [
                                    'name'  =>  'Paddock Name',
                                    'id'    =>  'paddock_name',
                                    'type'  => 'text',
                                ],
                                [
                                    'name'  =>  'Crop Type',
                                    'id'    =>  'crop_type',
                                    'type'  => 'select',
                                    'options'   => [
                                        'wheat'     => 'Wheat',
                                        'barley'    => 'Barley',
                                        'feed_corn'    => 'Corn',
                                    ],
                                    'placeholder'   => 'Select a crop',
                                ],
                                [
                                    'name'  =>  'Variety',
                                    'id'    =>  'variety',
                                    'type'  => 'text',
                                ],
                                [
                                    'name'  =>  'Plantable Hectares',
                                    'id'    =>  'plantable_hectares',
                                    'type'  => 'text',
                                ],
                                [
                                    'name'  =>  'Delivery Location',
                                    'id'    =>  'delivery_location',
                                    'type'  => 'text',
                                ],
                ],
            ],
        ]
    );
    
	return $meta_boxes;
});

^^ Just to clarify my comment above... I'm not trying to edit the CPT in the back-end, but have noticed that its not possible to view the CPT - i'm guessing because of the way the CPT is defined when created by the front-end-form..? And if it's not viewable, I don't see how it can be editable.

Does that make sense?