Still, agreed with @Lowendtech on the wall-hangers. Drill first, ask questions later. Your wife will prefer basses on the wall to unsightly holes created from removing the hangers you installed while she was gone...
I can confirm this will work, for awhile. And is how I was able to have a dozen or so caps not only nice and handy, but prominently displayed. Unfortunately, in the end, in order to preserve the domestic peace, I had to do a dry wall job.