The previous owner of my B+ added a bracket to support a TV or a monitor. He chose a good spot for visibility:
Even though it was bolted and had a backing plate it still flexed the particle board panel.
I made an Oak support that stopped the flexing:
The weight is now transmitted to the floor. The mount is bolted to the Oak then bolted through the particle board panel. Additionally, it is screwed into the underside of the over cab cabinets.
The Oak board covered the holes made by the previous installation and let me raise the position of the mount up probably 8 inches or so.