Since the location tracking doesn't work while the car is moving, adding a secondary tracking system may be something to consider.
If the car was stolen, the thieves would need to be smart enough to steal these cars. They would be able to disconnect the 12 volt battery, which would disable the onboard system. They probably would be loading the car into a container and shipping them overseas to be repurposed in another country. I looked into a GPS type tracker for cars recently, when the neighbors truck was stolen, and they need 2 things, 1) a data plan and 2) a power source.
I thought about playing around with those little tracking cubes (pet trackers) that ping off other phones. and send locations to your phone. These little things can be hidden on the car and if the car gets stolen, it might work. My daughter picked up some of the tracking tags a while ago and I was thinking about trying that out to see if it made sense. We aren't too concerned about the i3 due to the challenges of starting it but our other ICE cars and our trailer could be taken if someone really wanted to.
Can you image an i3 in a chop shop! Imagining the thieves playing around with the "large orange wires" makes for a segment in the Darwin awards.