Hello. I'm awaiting the arrival of a pair of Klipsch RP-400M bookshelf speakers which I will wall mount as surrounds. There's two options at the back of the cabinet for wall mounting: a keyhole at the top, and a threaded insert at the bottom. It seems that using the threaded insert, even with a smaller 9 pound speaker, would put undue cantilevered force on the wall bracket. Does anyone have any experience with such an installation? Are they expecting it to be installed upside-down?