Largest rubbermaid I own is I believe 40"x24", not exactly sure. I make holes on all four sides (not the top), however many needed per environment. Obviously the more humid you want it, the less holes you will need versus a desert setup. I posted this in a thread earlier... I use either binder clips or "S"- hooks to secure the lids. One the 40" long ones, I use 3 sets of S-hooks on the long sides, and I find the short ends do fine with the locking system they already have.
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