You really think this would be any sort of serious problem?
I get the idea this is a private parking garage accessible only to building residents. Sure people will do all sorts of smarmy sugar when the expectation of anonymity is high, but this seems like the sort of situation where that’s not the case.
Maybe I’m giving OP’s neighbors too much credit.
I do, actually. Eventually it will be, unless OP lives in a very small building (unlikely as OP mentioned 8th floor previously) or the charger is locked up. Income of the residents doesnt matter.... see all the model s and x owners who paid 80-120k for their vehicles line up to get their "free unlimited supercharging" rather than charging at home where it is more convenient.
At first it would likely be "i just needed a top up", or then it might be others in the building attempting to get this setup for themselves (hopefully the building planned for this).
Maybe I sound like a pessimist in this case, but there are people (no matter the income bracket) for which "if its free, its for me" and there are people who wont care that its assigned / owned by someone else. People even pull up to outdoor chargers at private businesses etc and try to charge.
It would be better to remove the "crime of opportunity" and lock up the charger in a box or something. I dont think many would break into it, but I do think people would use it if its "just there, with a sign saying dont use it". If everyone listened to parking signs, there wouldnt be people getting tickets for parking in handicapped areas, double parking, etc.