Pair BTicino switch K4003C directly via ZigBee to Homey

What other zigbee router devices (most mains powered zigbee devices are actimg as routers) are paired?
You can get an overview @ https://tools.developer.homey.app/tools/zigbee

What’s the distance between Homey or the nearest zigbee router?

Which obstacles are in between?

Did you tune 2.4GHz wifi & zigbee channels to minimise interference?