You can do a quote right in the app and play with the deductibles and coverage levels for either adding a new car or replacing an existing one. The only thing I declined was the mechanical breakdown coverage (which I always do) because the car is under warranty from Tesla.
I saved the quote (good for 30 or 60 days? Can't recall) so when I got the VIN, I went back into the app, added the VIN, coverage start date, and finance company - within seconds I had the insurance card to add to my Tesla account. It was SO easy..
Do your homework and good luck.