I am looking for an "opposing" 20 amp duplex outlet (if there is such a thing) or something similar. By opposing I mean where one receptacle has the ground on the top and the other receptacle has the ground on the bottom (I have never seen one but wonder if they exist). I have two 90 degree plugs that need to be plugged into on outlet. I have seen outlets that swivel so that the 90 degree plugs don not hit each other but I have only been able to find 15 amp ones. I appreciate any suggestions or info.