I bought a 9-piece mat for my Model Y. It stuck well when installed, but didn't fit perfectly. The mat that lies in the flat space of the trunk flexes in the middle no matter what I do. It was made a little big so maybe a piece of velcro in the area where it bends will help. The ones behind the seats are about 1/4 inch, so when you fold the seats down they rub against the other seats and lift the mat up a bit. The rear seat mats fit, but again they don't fit. It's a bit wonky if it overlaps on some sides and lacks on others. In general, they will cope with their task, but correspondence will be 85-90% correct. Carpets are fine in my opinion.
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