If I had one I wouldn't want it in the garage either, About the only place I would want to have it parked would be far away from the house or anything else that could catch on fire and have it parked in a concrete garage. My gut feeling is the chargers people have in their garage work on the trickle charge concept. If so I wonder if one could probably run a wire from the same main breaker box (if in the garage) to the concrete garage charging station. Not sure what gauge wire they would use for something like that, it probably would use a pretty big gauge wire.
The gauge of wire is not any thicker than for a hot tub or potentially even an electric clothes dryer. My hot tub runs off a 50 amp breaker.
I believe that the Tesla super charger does too. At least that is what my customer in Idaho who owns the Model S plaid told me.