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Two Wireless Receiver Xs in dual zone setup

The documentation on the Tado website appears to suggest the having two Wireless Receiver Xs in a single home is not supported. However, looking at the app it would appear that rooms can be assigned different "Zone Controllers" making a dual receiver configuration possible. I'm not sure whether this is a recent app update that now makes this kind of setup functional?

Background:

I have a combi boiler which has two zones controlled by valves, 1 for the radiators upstairs and 1 for underfloor heating on the ground floor. This has historically been controlled by two Honeywell relays. I currently have a Receiver X successfully controlling the underfloor heating with a wireless temperature sensor and would like to move to radiator thermostats to control the upstairs heating via an additional Receiver X.