Yes it should be taped directly to the flexwatt. Don't use metal tape for taping probes it can deliver false readings. You will need to tweak the readings some to get the hot spot high enough. My rack I use 94º on the t-stat and get 90 in the tubs. I lose 4 degrees to the wall and space between. This will be very stable as long as your room heater is stable. The ambient (cool) side heat will come from the room heater. Most use an oil filled heater. many choose to run this on a on off industrial T-stat like a ranco or Johnson.
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