That is what I have done too for Zigbee and Z-Wave (but only because I already had a large Z-Wave network before I started buying Zigbee devices), though you need to note that with mesh networking protocols it is best to have a large network, so I strongly advise against splitting your Zigbee network into more than one Zigbee network. You should really keep all your Zigbee devices on a single Zigbee network and make sure that have loads of Zigbee Router devices on that network. Spread out “known good” Zigbee Router devices evenly in your home and especially make sure that each battery-powered device has at least two Zigbee Router devices between it and the Zigbee Coordinator for redundancy if one of those Zigbee Router devices goes down. Again, the reason why that is and more is covered in my guide → Zigbee networks: how to guide for avoiding interference + optimize using Zigbee Router devices (repeaters/extenders) to get a stable mesh network with best possible range and coverage