Hello all. Getting ready to set a new kohler acrylic alcove tub that just happens to sit perfectly level when dry fit. Anyway, i usually use ledgers and concrete to help level acrylic tubs, but never actually installed one that didn't need leveling. Could i bypass using ledgers—kohler doesn't even recommend them—and just depend on the flange screws to support the back wall deck? Apparently kohler seems to think that's all you need. Thanks.