best way to mount glass shower shelf???

i have a glass shower shelf similar to this one
http://www.nova68.com/Merchant2/grap...0001/68528.jpg
I have a tiles shower room with cement fibre or similar walls on timber frame.
what is the best way to mount this type of shelf if you cant get it over the studs on the wall? i cant just screw into the fibre board, wont be strong enough, the shelf came with these crappy looking plastic fixtures that look like waste of time for my application and look more like masonary wall anchors http://www.made-in-china.com/image/2...-or-Nylon-.jpg
what way and what do i use to mount this shelf so it doesnt fall off?


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