Roof mount solar panel install

With my EPDM panels, they used some of the panel material as straps and screws within inserts for a tile roof.
 
I have a sungrabber (2) 2x20 panels in the mail. The strap system looks like something that can be purchased at homedepot. I know that I can go under the top shingle and I wanted to be able to go under the bottom shingle. Thinking of maybe aluminum L bracket on the bottom?
 
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