Mount And Blaed Key How Do I Mount A Picture Frame To A Wall?

How do I mount a picture frame to a wall? - mount and blaed key

I mount an 24x36 picture frames in a busy public place. The framework was eventually outbid by people on foot, backpacks, etc., so I need to assemble the wall structure can withstand such blows, she moved out of their way to not fall on people and not won tons of damage to the wall . Mounted on a single screw or bolt that besides the point. Ideas?