S-5! ProteaBracket (AL)

Very flexible but the double-sided tape is worthless

This bracket costs more than the Ribbracket, but it adapts to basically any rib shape (none of the 5 Ribbracket models fit mine). Good: very adjustable, and the l-foot can be flipped around to provide some flexibility in height/angle, to a point. The screws are beefy and hold well. Bad: I found it impossible to peel the double-sided tape film off, and on most I simply wound up ripping the whole tape off instead. The EPDM layer also wanted to come off. The tape definitely slowed things down a bit.

R panel bracket

Great product, easy install. The only bad is they added 20 brackets to the box to make it 100 as ordered but I was shorted the attachment screws significantly. I received 20 of the 80 required.