I always think its very difficult to get any kit level, besides should it not be the actual cd that's level and not the box it's built around?
My naim fraim is dead level and so is my LP12 plinth but the arm board and platter not so level, you level one area up and another goes out of true. I don't worry too much about this now as it still plays nice sounds. We are talking very slightly off level here, I'm sure there is level and there is level.
You are correct there is only level, plumb and square. The rest is out.