It's good to see this here. I just installed a cheapo 20W panel from Amazon ($50, although its reviews were fine), partly for money and partly because I didn't know the good brands anyway.
It was sort of a quick decision after deciding to pull the trigger on an Genasun 4A MPPT (also $50, is it any good?).
I thought a lot about how to mount it, and made some PVC lumber rail clamps, but then settled on just zip ties. Two go through the aluminum frame. The others go through the PVC lumber piece fastened to the panel with 3M VHB tape.