Where can I place UTH probe??

Ok so just got my thermostat for the UTh and looking to set it up ASAP. But where can I place it?

I have a glass tank, with a liner mat, and substrate down. Do I put the probe under the liner, or above it?

This probe came with one of those plastic pieces on it that will make it stick to glass, but I bought a hot glue gun as well. Should I ditch the plastic piece or stick this to the glass above the UTH?

on the outside. between the bottom glass and the heatmat like this:

~~~~~~~~~ <-- substrate
---------o------- <-- thermometer probe
========= <-- glass bottom
---------o------- <-- thermostat probe
------------------ <-- heatpad or heattape

I thought once a heat mat is placed, it’s not supposed to be removed? I placed mine before I even KNEW I needed a thermostat for it.

There are threads on this site that explain how to remove a UTH without breaking it, and I would use foil tape to reattach it over the probe. Also, from my experience, I'd suggest getting rid of the liner. I've had less than stellar experiences with those

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