Warm spots for critters

See this link: Critter 1: Tesla 0

Definitely possible:

http://www.digitaltrends.com/cars/stray-cat-found-in-tesla-model-s-motor-compartment-video/

Some have had luck with ultrasonic pest repellers (several available from Amazon). They are motion -activated and have a flashing light and ultrasonic sound that only the animals can hear. Also has an audible sound option.

I have never used these, so I'm not endorsing, but it seems like a couple of these might help.

There was a posting quite a while ago about someone in a similar situation finding that some animal had chewed through the UMC cable while the car was plugged in over night. If I recall, there were suggestions of putting a coating of animal repellent on the cable or otherwise protecting it in those circumstances.

Maybe keep a corgi or terrier in the garage?
Alternately, a warmed pet bed & adult garage cat - cat would munch on mice or squirrels.
wait - corgi would be better, couldn't jump up on the frunk!

don't have a MS (yet) :-( but I live in the city and have unfortunately experienced this problem with both our gas-guzzlers.
we've found droppings on top of our CRV's engine block. and one time in for service they found my Audi's wiring harness all chewed up.

one thing you could try: 100% peppermint oil

in both our cars, I soaked cotton balls and stuffed them into round mesh tea balls (tea infusers), and used wire to fasten a couple of these balls onto secure spots inside the engine compartment (away from any moving parts). downside is you have to re-soak the cotton periodically, not inexpensive. Plus I don't know where you could attach these in a MS since no engine compartment...

anyhow it seemed to work in our case last winter, although if you read other reports on the internet some say peppermint oil's effectiveness is a myth, so YMMV