Gritty,
My recommendation would be to go purchase couple rubber tie down straps. You can typically pick them up at a local hardware store for a few dollars. You can then use the side of the shelf to secure the strap's hooks to. With the proper sized strap, you can get enough tension to keep that sucker in place. I would only run the straps over the top of the device going side to side (not front to back). The rubber on the strap will prevent the device from sliding anywhere.
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