Recommendation for a WLAN controllabe bathroom radiator

I have a towel radiator in my bathroom and would like to be able to control the heating cartridge with OH. This question was asked here and using a Shelly to switch it on and off would most certainly work.

However I’d prefer a solution that would allow controlling the power (maybe in steps like 300W/600W/900W) to optimize solar energy usage and add other things like temperature of the radiator in the mix.

I have found this Smart Veo gadget or this one but can’t tell if there is a binding for it.

Tuya bindings would be ok. I don’t find it to be terribly convenient, but there are a lot of affordable appliances out there and after the initial setup and hoop jumping, they work.

I am in Austria, so the thing should work in Europe and be available here. Any advice would be greatly appreciated.