Having a few dedicated Zigbee Router devices will make a huge difference when just getting started with Zigbee and you have not yet have added many non-dedicated Zigbee Router devices, but those dedicated Zigbee Router devices might be ok to remove if and when you added many other non-dedicated Zigbee Router devices that make up the difference. Regardless, you can never have enough Zigbee Router devices. Again that is also 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
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