I would buy the Tesla Shop rear rubber cargo mat. The trunk is felt-lined, so the cargo mat provides a tough, easily cleaned surface. It fits perfectly, and, best of all, it is made by Weather Tech and has a Tesla badge. Other members love the Maxspider liner, but I don’t see the advantage. The Maxspider is supposed to be good quality, but costs more and has a huge badge that reviewers have complained about.
I also love the sun visors as they add to the infrared and ultraviolet filtering of the glass roof.
I like the high power wall connector, but my car got here faster than the connector so I had to charge at 120v for 2 weeks.