Hi, I bought a home entertainment unit and just completed cutting holes into drywall (2"x 2.5"), 'fishing' the wire through the wall cavity. Unfortunately, I didn't take into account, for the panels to remain well secured to the wall, I must cut the hole right next to the frame. Instead, I just aligned it according to where the sofa is and now I am having a hard time mounting just the plates alone with 2 screws (the drywall is chipping because of the small distance between the hold and where the screw is going in!)
To give you a better idea, here's a pic of the plates I am using: