Forgive me … I haven’t read through any of the comments
I was short of space in my snake room / man cave so I simply stacked the wooden vivs on top of each other.. mainly double stacked but a couple of stacks of three vivs
The main thing to remember is that heat rises so have the warm ends matching up .
I used to put a piece/pieces of wood in the middle of the lower vivs to add some strength/support
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