you can set your real thermostate, external temp. sensor and off course window sensor. working fine. just try if you have callibration issue with your TRVs. BT (1.7.1 beta 5) is calibartion (offset and None(important), Cheers! After that set for each one Automation /Room and i recommend HACS Schedule 3.3.8 from @nielsfaber (no internal sensor or internal schedule from Sonoff TRVZB).
#Workaround for Sonoff TRVZB and external Sonoff SNZB-2D Thermostat for "smart" heating
brittle hazel