While I have noticed is that most heavy duty angle plugs seem oriented for ground down outlets; fridges , freezers and some window A/C units are oriented for ground up. Go figure
So, the debate rages on.
My fridge has a cord that exits the plug on the ground side, so it goes down when plugged into a ground-down receptacle. This works well if the receptacle is mounted partway up the wall (or over the adjacent countertop in my case), but wouldn't work for a ground-down receptacle close to the floor.
