I’d recommend that you have a flash drive, SSD, or MicroSD w/ adapter formatted and ready to go for delivery.
From there, floor mats, a screen protector, and console wrap if you don’t like the piano black console. I also picked up a console organizer for the front compartment under the phone holder.
I contemplated PPF but decided that the investment wasn’t worth it as I’d likely be trading in my Model 3 within a few years and likely will not see that investment in the trade-in value. I’ve picked up a couple good rock chips but nothing a little touch up paint cant fix.
Look into a faster charging solution depending upon your at home parking situation. A wall connector is highly recommended if you can accommodate one, otherwise an adapter for the included mobile connector is recommended. Depending upon where you live, the higher current helps with keeping the battery warm during the winter while charging & pre-heating your car.
I have a Model 3 Performance Stealth/Sleeper/Unicorn or w/e the kids are calling them these days. I liked the performance pedals and carbon fiber spoiler, so I found some great alternatives on Amazon and just put those on in the last week.
Overall, I am quite happy with the above accessories.