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The floors don’t need to be perfectly flat, but the flatter the better.
I did have a problem in an apartment once where the plywood floor had some previous repairs and was uneven in some spots.
The LVT planks themselves are quite strong, but the where they inter lock is of course thinner and a weak spot. If that joint flexes too much from people walking on it, it can crack, and then the planks separate.
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