This is exactly what the [portfolio_map] shortcode renders on your WordPress site. Hover a marker to preview the project popup. Click navigates to the project page.
Demo data — 12 sample portfolio projects across the USA
Hovering a marker opens a popup with the project name, tags, and a View Project button.
Clicking a marker takes visitors directly to that project's portfolio page.
Marker color, map height, and zoom level are all configurable in the admin settings panel.