I'm trying to install mirror brackets into my wall for a lightweight frameless wall mirror (58" x 16").
My attempt at using a hollow wall anchor (Hillman 1/8" DXS drive wall anchor) didn't work very well. The drywall appears to be 3/8" thick, and directly behind it is some plywood that appears to be fairly thin too. The anchor just chewed up the drywall leaving a 3/4" diameter hole.
What's the correct fastener to use here?