I'd like to mount three hooks to the wall to enable TRX work and band work. One high (TRX, full weight), one middle (band work, light weight), one bottom (heavy stretching bands, medium weight). I weigh 200lbs so assume max pullout force is 300lbs.
The section of the wall that I need to mount the hooks is between a corner and a doorframe, and does not have any studs, metal or wood. There is a metal corner bracket shaping the drywall (standard). Photo is at the bottom of this post.
My thinking is to buy a sturdy sheet of 1/2 ply, cut it to width, and attach it with multiple snaptoggle anchors. Despite this distributing the weight, I've never relied on only drywall for this type of force.
Any thoughts on how realistic this is and suggestions on other approaches?