Sorry, but I have yet another question about the install of Tuftex panels. Their instructions are a bit limited. Question: which side is up. Should the panel begin with the side edge up? or down? I would have presumed down, but I read somewhere that you want to start with the outside edge up.... but, if that is the case, connecting two panels where they overlap would result in screwing in a valley. not a peak as specified. What have you all done?