The Monster Rack Front

Well my snakes were starting to take over so I built this beast. This monster hold 12 rubbermaid bins that are bigger than a 20 gallon long tank and about as high. Then on top it hold to more bins that are not as high but wider and longer than the other 12, so my snakes always have enough space. On the bottom the mansion houses my tegu (magoo) but can def house just about any size snake. All in all the rack is over 6 ft high and about 4 ft long and 3 ft wide. I havent heated it yet because I am looking for the safest route. I was thinking of using a sort of heat rope called handy heat. If you can help me out that would be great! My email is shumb001@fiu.edu
Thanks for looking