I'm using Z-TRM3 by Heatit for a part of our floor heating. The controlling itself works just fine, but I've seen a bit of interference on z-wave network after installing that and also there's an annoying feature that you can't manually control the heater if you turn it off from z-wave (I want that my devices can function as dumb ones if needed). So, not an answer to your question, but based on that one single unit I wouldn't recommend that, even if it's decently priced and looks pretty good on paper.

Im doing this with esphome, i replaced the thermostats with dht22 sensors and wired the valves via solid state relays (one for each zone) to the esp. Im using an esp with ethernet (wt32-eth01 clone), but wifi can work, if you can place it outside of the metal box of the heating system.

For control you can use a pid controller. I think there are some, which can run directly on the esp if everything is connected to the same esp.

Note: Dont use dht22 in the bathroom, it will slowly get less accurate when exposed to high humidity. Running the onewire of the sensors straight through existing 5 conductor thermostat wire/1.5mm^2 wire works reliably

Have a look at the LinkedGo wall thermostats. They have Shelly chips inside so rock solid and great compatibility with HA.

I’m also using Heatmiser (Neo) with HA. It’s fine, and it’s controlled locally.