Yes, you are right, I forgot to mention in my answer:
https://toolset.com/forums/topic/member-profile-page-display-members-near-me-view-select-url-custom-fields/page/2/#post-1147104
I have put the PHP codes into your website:
Dashboard-> Toolset-> Settings-> Custom code:
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Name "map-center"
More help:
https://toolset.com/documentation/adding-custom-code/using-toolset-to-add-custom-code/
For your other question:
Q1) Can the pop-up with the member neighbor show their profile image, name, location and click to their profile page?
There isn't such a built-in feature within Toolset map plugin, the document you mentioned above is different from your case, in the screenshot:
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There is only one post, but with multiple images.
But in your case, one post has only one feature image, I suggest you put the featured image shortcode [wpv-post-featured-image] into marker shortcode, like this:
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section "Loop Editor"
[wpv-map-marker map_id='map-1' marker_id='marker-[wpv-post-id]' marker_field='wpcf-mbr-biz-address'][wpv-post-featured-image]<div style="text-color:#3f770e">[types field='company_name'][/types]
see the result here:
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Q2) Can that marker stand alone, and the other 4 are grouped together?
I suggest you change the map shortcode, disable "cluster", like this:
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section "Loop Editor":
[wpv-map-render map_id="map-1" cluster="off" spiderfy="on" map_type_control="off" street_view_control="off" style_json="//membership.eyeprosper.com/wp-content/plugins/toolset-maps/resources/json/Silver.json"][/wpv-map-render]
More help:
https://toolset.com/documentation/user-guides/maps-shortcodes/#wpv-map-render
cluster. Optional, defaults to off . Can be on or off . When set to on, markers close enough based on some rules will be rendered as a cluster.
See the result here:
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click the bundled markers, you will see each marker.