If I'm installing over concrete how "level" must the floor be and I understand a vapor barrier is necessary? Would planks or squares be better if the floor is not exactly level?

Planks or squares will not make a difference. Per the installation instructions, subfloors need to be flat and level to 3/16" over 10'. Any humps or dips should either be ground down or leveled using a Portland based self leveling compound.
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