I'm far from an expert on this, as where I live we only put them on pads, but my father-in-law in Ontario has his on a metal bracket attached to his wall. It's basically an 'L' shape. All of his neighbours have the same set-up.
A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Helping You to Do It Yourself!