My plan is to install the outlet adjacent to the garage door. This way, if I need to have my car parked overnight in the driveway for some reason, I can pull the charge cable out of the garage and still reach the car.
If you put the outlet in the back of the garage, then you probably won't be able to reach the car to charge if the car has to remain outside for some reason.
This assumes you will normally pull into the garage nose first, and then back into the driveway if you are going to leave the car outside.