I'd only use it if the ambient temps are too low. I've had to use a heat lamp in my tank only a couple times in the winter and that was all, and only for short periods of time. You can get something like this
http://www.amazon.com/Floor-Protecto.../dp/B001MY6VS8
They are at any home improvement store to raise the tank off the table if you want. The UTH should be directly on the bottom of the tank though so you may need to tape it (I use aluminum tape...also at home improvement stores). It is not a fire hazard either way, as wood doesn't ignite until over 400 degrees.