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Looking at HESPV's information sheet for this panel, it is not obvious how to fasten them down without the rather expensive standard hardware. I see slots in the back of the panel... something must hook into the slots?? I want to support the panels with wood, fastneing them securely so they don't slide off or blow away. Is there any available hardware that I could hold the panels to the wood with? (HESPV is NOT diy friendly, and I can get no info from them)