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Just for clarity. I place the probe of the fail safe on a different piece of heat tape. I usually place the primary in the middle and the fail safe in the top with is usually a little hotter than the others. Normally it will become the warmest fastest. The temps are likely going to be different you have to play with it to get everything right.
So many have bought racks but few understand that a rack really needs to be in a controlled ambient temp to work well. It can be used in a cool room but it is a huge pain. I just thought I be clear on that, just in case.
Tubs change size a few years back rubbermaid changed all the sizes my old ones are shorter than the new ones with the same code. I'd suggest buying extras no matter what.