I noticed few time on a 150 kW Superchargers that the plug wat put vertically above the charger.
I guess this was, may be, to indicate that the charger was broken?
I was surprised because few days before I used this particular charger.
I check the App location and there was indication of a not working charger.
So I tested on my car and the charger was working fine...
I think some people don't want to have to share the charger and use this trick.