We have a system in our bathrooms from Warmly Yours.
https://www.warmlyyours.com/en-US/floor-heating
Plot out the floor plan and they send a mat that you put down. We have our on top of porcelain tiles. Out guest (not that many) always love it after taking a shower and stepping out onto a warm floor in the guest bathroom. It is wonderful if getting up to pee in the middle of the night when not wearing shoes.
Just be very careful to not kink or cut any wires, and it all works fine. The thermostat is a real challenge to program if you want to have it lower the heat when you leave and warm up when you return. Since my wife is retired, and I work from home, we just leave it set all winter. I just turn it off in the summer months when the AC is running.