Smart floor controls with only 2 connections available.

We have built or had built - (Move-in 2023) we have extremely ugly simple old floor controls everywhere. I now wanted to replace them with Meross Smart Thermostats - in doing so, I found out that only two wires go to the control.

What options do I have now? I am a bit surprised that in my office (the heating is surely 20 years old) it was no problem to connect.

Don't understand the problem.

1. Are two lines one too many or one or more too few?
2. If the heating is correctly set, you are more likely to switch off the unnecessary controls than to upgrade them.

2. if the heating is correctly adjusted, you are more likely to turn off unnecessary controls than to upgrade them

This would be the smartest solution.