Either can work. Really depends on what is best for your situation.
The hot spot should be set between 90 to 94.
The tstat probe can be mounted between the bottom of the cage and the uth. Then it is suggested that you have a thermometer probe set on the bottom of the tank (inside) to monitor the floor temp.
I keep mine at 91. With newspaper you will not need to put it much higher than where you want it. I would try 91 and see what that gives you.