The problem with the B location (that’s the one most vendors are using) is that it covers all the storage area of the center console, thus making that storage area less useful. So when you want to grab your gamepad to play Tesla arcade, or place there a big bottle of water... you have to remove the wireless tray.
That center console space is the only main storage space at the front of the Model S, because it doesn’t have door pockets. So blocking it with a tray to put you phone isn’t a good idea. If the Model S had door pockets... there would be no problem...
That’s why I think that A location is better. You enter the car, put you phone there and it charges... and when something happens on the phone screen....although the angle is far from perfect... you can still see that something happens.
It seems that Tesla is very close to releasing a wireless phone charger for location A in the coming weeks.....