yep, make sure the placement is like how it's outlined in this helpful diagram from Mr Mod Pitontheprowl.
Edit: also looks like that thermostat u have is rated up to 600watts which would be good for running a rack w/ a long strip of heattape and your UTH is rated up to 24watts. u don't have to buy the higher wattage thermostat if they offer a lower watt one for less.