Think putting Superchargers on the upper floors of shopping centers is a good idea.
The first floors seem to fill up the quickest, and putting chargers there would cause ill will with the regular shoppers who want the closest spots as possible.
It will also not be as popular with local freeloaders who just want a convenient spot to grab some free juice. They will not be happy to need to drive up 3 or more floors to just grab some easy electrons. Will be easier for them to just charge at home. For those with no personal charging options, they can get a weekly top off with little inconvenience.
For travelers it will be fantastic. They can plug in for 1/2 hour or so, wander around the stores and perhaps get something to eat while they get enough to travel to their next stop. WiFi usually available, along with clean restrooms instead of a porta potty.
The malls usually have 24hr roving security, so travelers can feel safe in a strange town. Chargers will be more protected from vandalism than in a out of town remote location.
A security guard in Temecula Ca. noticed I was moving from one stall to another. Asked why, and when I told him it was charging slower than expected, he said he would make a report to Tesla for us.
The shops will be cool in the summer, warm in the winter. Lots of food choices, or just tilt back your seat for a power nap, as your smart phone will ring you when you have gotten enough charge.
For some, it might not be optimum, but for the goals of providing fast chargers for travelers, it might be a pretty good idea.