Thanks for your fast answers and help!
@RoyWissenburg , point taken. Would it be the solution to build my mesh from scatch across all rooms, instead of building room by room, one by one. I.e. install a few lights/routers in the living, few in the hall, few on the driveway. And after that add the rest of the complete network, routers as well end devices. Total installation would be about 70 lights and 25 end devices as I expect now, all zigbee. (Nearly everything Ikea tradfri and Xiomi Aqara)
@robertklep , sorry, i’ts my inexperence. I read a sort like answer before, but I still don’t understand if I need to hold the end device in pairing mode besides the Homey, or besides the light/router in that final location room. Or “just in the final room”. (so; booting up the homey in that specific room, wait for total initilazisation and than pair the end devices in that final location. Afterwards booting the homey for normal running in the utilities closet and don’t touch it again)
Sidenote; I will turn off the driveway lights (16 routers) and then pair devices in the house to try if they will be forced paired through a router. But let me first understand if I need to re-build the mesh from scratch to have good coverage - or spread some of the driveway lights to inside and rename them / keeping them as routers of the first 20 connected devices (Roy), and where to hold the end device while pairing (Robert). Thanks again!!