Zigbee hub/dongle and positioning - newbie questions

Possibly not. Zigbee relies on having a swarm of mains powered devices passing commands on from one to another. They are quite low powered - a typical setup would have zigbee lightbulbs throughout the building so that the distances involved were never more than a few yards. There’s a post about it here.

The Tasmota plug should be OK, though, provided the wi-fi is.