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i would say that attaching that, plus the weight of the wood and whatever the shelves, rail and hook need to hold are beyond the capacity of fasteners that fit in those flanges (flanges are the circular flat bits with the screw holes in).
i think you would need some kind of bracing below. angled pieces supporting the shelf from below.
just read back @ffm comment and basically the same thing lol
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+1 @Mickie_Cricket, if there's no bracing of that unit above or below then those tiny flanges won't hold it regardless of what you fix it with.
The hooks are or hats.