In my experience the wall mounted unit will control the temperature if placed in the appropriate location.
How to install a double pole wall mount thermostat.
Two of these are live wires and two are load wires.
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While this type of installation is easiest since it does not involve opening up walls it is considered to be inferior to installing the thermostat on the wall.
Thomas with cadet tech support shows you how to install a double pole wall thermostat on a 240 volt electric baseboard heater.
Typically this is marked l1 or line step 8.
Make sure to connect the ground to the thermostat or wiring box if available.
For one thermostats situated in the lower 6 inches of a room are not accurately measuring temperature since cold air sinks.
You should be able to bypass the unit thermostat and utilize the wall mounted thermostat only.
Stop the next steps will differ depending on which thermostat you are installing for single pole thermostats.
Since you are working with a double pole thermostat there should be four wires.
Using a wire connector connect the hot supply wire to the thermostat wires.