I only use a UTH.
What I did was with my UTH i placed the probe from the Thermostat between the UTH and the glass of the tank. Set it to 92 and let it go for an hour. after a hour I moved it up 1-2 degrees depending on my numbers and waited another hour. I did this until my hot zone temp was right where I wanted it.
This thermostat will turn on when it is 2 degrees below your max setting and turn off at the max setting. SO your hot spot will move around a bit but should stay pretty close to what ever you want it to be.
Also I have the probe from my thermometer inside the hide side hide since that's where the BP will be anyways. I have that probe attached to the bottom of the tank on the glass just in case my BP burrows down to the glass I don't want it to hot.