Mount it under the bottom of the tank on one end. Use something like aluminum tape to stick it on with, that way it will be easier to remove and re-apply if need be. A good way to tell if you have the correct size is the UTH should cover approximately 1/3 to 1/2 of the floor area. I strongly recommend getting a thermostat or dimmer to control it, because an uncontrolled UTH can get hot enough to burn your snake.
I would also suggest using a thinner layer of substrate which will allow the heat to radiate up through it better. About 3/4" to 1" will work fine...
Here are a couple of pics of how mine are mounted. I use tubs but the mounting is the same for a tank...
First, the thermostat probe is mounted in position...
Then the UTH is mounted on...
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