I had 4 feet of a wire shelf left-over from another project, so I put it up in the garage, over the workbench.
The wall area over the workbench is covered with a 1/2 inch or 3/4 inch piece of plywood, so it was easy to attach directly to it with wood screws. I had a little bag of clips left over from other wire shelves (in the closets, utility room and garage). I had to buy the two diagonal shelf supports. This took about an hour and a half to install -- the hard part was getting it to be level.