Try contacting the rack makers, maybe? like thule, yakima, saris to name a few. there were no racks listed for my subaru tribeca when i first got it because it was a new model at the time and they haven't been tested yet so the car model won't show up in the fit manual. i ended up getting the saris on the recommendation of my local bike shop and it worked fine. saris has since added the tribeca to their fit specs. if you get a trunk mount be sure the car is clean where the rack rests on the trunk. any grit or dirt could scratch the car and on a tesla that would be very depressing. also adding an extra cloth or thin foam piece would protect the car further. good luck in your quest.
hey- electric bike ; electric car. nice.
We tried using a trunk mount rack on our 2006 Subaru Tribeca and it worked, but once the we put on two adult bikes + two kids bikes we noticed the plastic dipped hooks were trying very hard to distort the car's sheet metal at the top of the hatch where we hooked the rack. We'd already bent the metal on a Suzuki XL7 hatch and didn't want it to happen with the Tribeca so we installed an aftermarket hitch instead, for a hitch rack.
I think trunk racks are not the best idea to adapt to a hatchback where more weight is distributed to the top strap hooks instead of the top arm rests. But for a sedan where weight can rest on the upper and lower arms, they make a decent compromise.
With our 2013 Tribeca we got the factory hitch installed at time of purchase (same with our Forester 2.0XT turbo. I installed an Ecohitch Invisi on my 2017 WRX, for a rack, which hides behind the little removable plate in the rear bumper. It works great with our Yakima Holdup 2 rack.
Maybe there is an aftermarket hitch like this for a Tessa? (Pics on request).