I see things on wall mounts and furniture with attached mounts saying things like "maximum TV size 55 inches and 135 pounds". The panel is rarely within 50 pounds of the weight limit. So what exactly does the inches measurement mean? It seems to me what matters is the horizontal and vertical distance between the mounting holes on the back of the panel, not the diagonal size of the panel. Neither the TV nor the furniture manufacturer give those numbers. If I were to get, for example a 60" Panasonic ST60, would it not fit these items?