In the new NPM Worldmap, you can add multiple devices to a single location to the worldmap, but cant add a group. You need to make sure that all nodes are pointing at the single location and do not miss one (or add one that does not belong to the map location).
This also means that if you modify a content of a group you need to remember to modify the map and it does not allow you to click on the group to get to the group page like the "static" atlas map would.
We have a geographically dispersed network, and we use groups to monitor devices in each site (Telco style). Having 30+ devices on 30+ sites will be painful to manage... I have great hope in this new feature if this could be sorted out