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I installed a set of black carpeted mats from ForMyTesla.com with a custom logo "MODEL X" and vinyl trim to match my tan leather interior. I also bought the optional frunk and two trunk mats: one for the 3rd row seats down and the other (with logo) for the Shelf Trunk.
The 3rd Row Down mat can be stowed easily when the seats are raised; the Shelf mat stays in place even when the shelf is rotated up into the position that gives access to the cargo well underneath.
I am very pleased with the quality and fit of these mats, which are rubbed-backed for non-slip in the passenger cabin. Jerry at ForMyTesla.com gave me superb customer service.