Underfloor heating control (EU)

I am looking for a smart underfloor heating solution. At the moment I have dump wall thermostats, some with time control. They close a relay then the target temperature is reached and then the motor opens the valve.

I want the thermostats to work even if the connection to Home Assistant is lost.
My favorite option looks like this:
I define a time plan for heating in HA and this time plan is synced to the wall controller. I would also prefer zigbee devices.

  • Would NS Panel from sonoff fit my needs (besides zigbee)?

  • would flashing tasmota make sense?

  • Can the " Bosch Smart Home Raumthermostat II 230 V" sync my time planes and store it locally?

Any other hardware which I could use?