My 04 Phaeton the entire floor was perfectly flat and one level. I did have to float a little leveling compound behind the console where the entrance step cover retracts. My LVP just floats and is not glued down. Demo of the old carpet and tile is the biggest part of the job.
Happy to share more info if you want it.
Mark & Jen Rayor, Baja Ca Sur, Mexico
04 Phaeton 38, 3126E Cat 330 AKA "Big Pooper"
Mini Cooper S toad