Another vote for ceramic tint.
If you’re in CA, go for the License Plate Wrap instead of installing a license plate frame with metal plate on the front. It’s totally legal and is IDEAL for the Model 3. Obviously, no plate is best, but you’re risking getting pulled over without one (it’s happened to me).
The stock door puddle lights and the trunk lights are very dim. I got a set from Amazon and they’re MUCH brighter (pic attached). Very easy to change out.
Also got a rear trunk sill guard. It’s easy to scratch the sill putting stuff in or taking stuff out of the trunk (pic also attached). Looks better, too.
Got a holder for the charger. Looks better and very inexpensive (see pic).
Also got some warning stickers from The Dashcam Store advising that you’re being recorded. Got them specifically for the rear triangle window for the M3, which rumor has it, you can break and it won’t set off the alarm. Abstract Ocean has some warning stickers that use the Sentry Mode graphic, but they’re too big, IMO.