Wowww!!!! thanks for all the amazing replies guys. First off let me say I am no expert with this type of stuff so the information really helps.

Ok so the thing that caught my eye on the animal plastic racks is it seems like you could either get a larger tub (for a midsize to adult BP) or two smaller ones and slide it in the same slot, is that the same for the RBI racks? Also do I drill holes into the tubes myself, how many on average?

Now with the thermostat why did I see some bundles with like a power strip, extension cord, etc. That's not required is it? Also do I just line the tape to the rack itself or the tubs? And would the thermostat probe be inside a tub or outside? If I was to get a couple more BP's would I have to redo my tape each time?

Sorry for the 20 questions but I really want to get this right as I want to make a purchase tonight.