Thanks for the reply! On question to better understand how Zigbee works: Is it so that when I add a router capable device, the other devices will over time adjust and find the optimal route including the newly added router? I do not need to trigger this in any way?
YW! True, the zigbee mesh is dynamic and not managable.
Aqara sensors seem to stick to their original router device (Homey controller itself or a router device), so when it tends to “fall off” the mesh, consider re-pairing them at their final location. Athom’s zigbee wiki
Keep in mind, your (or neighbour’s) wifi can interfere with your zigbee network(s). Wifi - zigbee check