Door and opener not yet installed but otherwise ready for rough inspection. I can calculate where the opener will likely be which is right behind and slightly above the opened door. However, the 2x6 rafters are unusually high at about 12.5'. Where would you mount the 20A receptacle in this case? Should it be on the side of one of the rafters which will likely require a near 4' drop to the opener or is there a recommended way to lower the receptacle box from the rafters? (wood or metal extension?). Thanks for any ideas.