After a day of research, I decided to order this ZigBee Thermostat:
Worthwhile ZigBee mentions:
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https://www.sinopetech.com/en/product/smart-floor-heating-thermostat-3600-w-zigbee/
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https://moeshouse.com/products/zigbee-002-thermostat-for-heating-boiler?variant=39802433011793
WiFi option I considered:
The issue I have with this is that I’m not sure if it’s even possible to install a relay/dimmer behind the light switch in a 4way traditional light switch, as the cables in EU are just “forwarded” in a loop to the next switch