I have a child gate I am trying to mount at the base of a staircase. On the left side of the staircase is a thin wall. When facing this wall, there is only a 1.5" gap between the stair trim and the wall edge-- I need to mount a roughly 18-inch vertical bracket for the gate inside this 1.5" strip.
Because this bracket is part of the hinge for the gate, it needs to be mounted quite securely. I'm unsure how to do this. I'm not totally certain of the inner anatomy of the corner, but I drilled two 1/8" pilot holes at the bracket mount site ("Drywall Sheet A" in diagram) and went through a metal corner bead and drywall-- no wood. I drilled the holes 1/2" from the corner, and now I actually think I may have sheared the back of the narrow drywall sheet making up the other part of the corner ("Drywall Sheet B" in diagram). I'm now unsure of what to do or whether it's even feasible to mount the bracket in this location.
Can anyone tell me how to get a secure mount with this kind of setup? If I did shear Drywall Sheet B, would it be OK to just use a regular drywall anchor, which I guess would protrude into the back of Drywall Sheet B?