If your house is greater than 2500 sq. ft. and less than 5000 sq.ft and has one electric panel box, you need two pairs of power savers. Place the first in an outlet closest to the panel box, serviced by the right side. The second is placed midway up the box in an outlet again serviced by the right side. Do the same for the left side service.
Oh brother! What possible difference could it make if you plug two of these devices into circuits on the same phase next to each other or not. We're talking near speed-of-light transmission of electrons. This is as silly as those hi-fi enthusiasts who worry about left and right speaker wires being the same length.
You know electricity and this is complete bull-—right? Thanks