A friend placed his on a shallow roof 5 deg. slope, and didn't fasten them, at one point they almost came down due to wind.
What you can do is to use the type of webbing (flat straps) that they would supply you anyways, and loop it through the holes in the panel placed there specifically for the webbing , bring your cut ends to the top, overlap them, melt a hole though the webbing, place a screw with big washers through, lift a shingle and mount it under the shingle with lots of tar. Preferrably, have someone inside teh garage roof placing blocks for your screws to bite into where they come though for extra strength.
Work your way up from the bottom panel
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