The thermostat probe has to monitor the UTH directly, with as little influence from ambient air as possible. That makes that the best position possible.
You DO get an accurate reading from the digital thermometer probe you place inside the tub directly over the center of the UTH, probably with something like a glue gun or super glue. This is what you depend upon, and ignore whatever the thermostat says the temperature is. You want to know the hottest possible temperature inside the tub, and set the thermostat/UTH to whatever gives you the desired temps inside the tub, with a 95 degree max.
I actually put the probe on the outside of the UTH, because I have two on one thermostat, and the probe kept the one UTH from making direct contact, while the other DID make direct contact.
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