My rack idea, comments?

[OhhWatALoser]

You can put it on the sides, but your snakes are definitely going to need belly heat. Heat tape is very inexpensive and it goes by the foot, so for 6 tubs it would probably be less than $20. But make sure you have belly heat on your snakes.

may I ask why they need belly heat? I have found that not to be true at all.

Belly heat it is! Thanks guys. Also, does it matter if the tubs get super humid? I noticed mine do

As long as no mold grows

Also, is back heat what I was referring to in my original post?

yes

I'd like to do whatever would work best with not regulating the tape. Right now I have rocks in the tub above the heat tape so it's not too hot

There nothing that could be considered safe at all without regulation. Get a thermostat to make life easy.