You also have to consider acclimation. If you have extreme hot and cold seasons, and the units may be vacant with A/C or heat off, vinyl plank expands and contracts. The floating floor accommodates that. There is also glue down fiberglass core plank that is more dimensionally stable than vinyl. They can have a range of 45-115 degrees with the proper glue. I have seen vinyl plank contract that was installed during the hot summer months either when the A/C was finally turned with normal use, or on a cold winter day when the unit was vacant and no heat on. In contrast, I’ve seen vinyl plank installed in the winter that expanded and caused “tenting” when the unit was vacant over the summer with no A/C. Tenting is when the length of the plank expands and it forces one or both of the plank ends to pop up from the floor. If vinyl plank is used, the unit must be kept @ 60-80 degrees at all times. Vinyl plank only expands and contracts in the length, not the width.