double stats would be the best way to go trice, is what i use with my boas, that way you have full control of both vivs otherwise the top would one would be hotter than the bottom one and difficult to keep both of them at the same temps if theres only one probe!
on my twin stats i run 3 mats, the mats on the floor are joined together via a double socket and then into the unit for each viv in my stack, as long as the wattage of the mats does not go over what the stat can deliver you wont have a problem
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when in doubt, use the gaffa!
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