Marker Cluster in Google Maps indicates multiple nearby locations marked up in an aggregated form in a map. You can create and display marker clusters on your Google map by activating the WP Google Map Pro plugin for WordPress. The Map below is marking multiple locations using draggable markers over the same Google map.
This google map wordpress plugin is available on codecanyon to get it.
Customize Product according to your requirements?
We will be glad to discuss any of your needs related to our wordpress plugins . if any of functionality you'd like to see in products, you can reach us by via email firstname.lastname@example.org.