What are the benefits of a Floating Vanity over a Vanity that is secured to the floor?
Most standard type box vanities are constructed with a back stile across the width of the unit at the top/back. We never connect them to the floor. We find the studs in the wall and screw the back stile to it. When doing this, you can correct the level both side to side and front to back. Strategic use of shims helps in the leveling process, but the screws lock the vanity in place.