The caveat here is that what works for breeders, in dedicated snake rooms, doesn't always work for the average individual keeping only a few animals.
RBI themselves state that the ambient room temps must be well into the 70s for 4" heat tape to suffice in a 41 qt tub. If your rack will be in a room at usual living temps ~68-71, you run the risk of the tape not providing correct ambient temps in the tubs, and might need to add supplemental heat to the rack.
Just wanted to throw this out there for those that might not have the means to maintain a dedicated reptile room, or live themselves at reptile appropriate temps.
Even though I advocate for Beeger Boxes, I have been waiting over a month for the unit to ship. I would LOVE to be able to use RBI racks, but my reptile room currently isn't temperature regulated enough to accommodate them.