You can leave the accurite thermometer on the top of the rack, bundle the excess wiring in a bread tie leaving just enough to go into the tub and read the temperature of the hot spot.
Open the top tub and scan, open the middle tub and scan, open the bottom tub and scan.
Takes what 1 minute total maybe two, I check tubs pretty much every day with my temp gun, it's about as easy as you get.
The t-stat can mount on the wall and the probe goes against the heat tape on one of the shelves, at least that's how it typically goes.