What I do is I place the probe directly on the heat tape in a area that won't effect the tubs from sliding, it doesn't have to be under the tub. I place a few pieces of foil tape on the probe and on the cord to make sure it won't fall off. After you tape down the probe you just have to adjust the setting on your tstat to achieve the proper temp you are looking for.
For example my tstat is set to 101 and that gives me 93 for a hot spot. Yours will depend on your set up and tubs.
Hope that helps. Anything thing else feel free to ask.
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