Question 2 was answered perfectly.
Now to question #1
Most PVC racks are wired in serpentine which means one piece of heat tape running through the entire rack, it is the case with AP, I cannot tell you about RB since I do not use their racks.I've read from ReptileBasics that 3" heat tape is 4 watts per foot, and a 500 watt thermostat will run 90 feet total. I doubt the AP375 has 90 feet of tape. I don't know how it's set up, but am projecting it would be closer to 15 feet of tape or 60 watts. Even if it is closer to 100 watts, it should be safe, right? Or am I missing something? If it isn't reliable, what would you recommend?
Most reliable thermostat such as VE or Herpstat have a 500 watt output which is more than enough for most rack.
With your AP rack which is 6 shelves you are looking at about 15 feet of heat tape or 60 watts total output.
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