In the current versions of Portal it is quite difficult/impossible to display multiple pins on the exact same location. We have another Map-solution which handles this quite well, and I would propose something similar be added to the map for Flow Connect. See attached screenshots.

We have used these libraries to achieve this: https://github.com/Leaflet/Leaflet.markercluster
https://www.npmjs.com/package/react-leaflet-cluster