It worked on the Oceanic with perimeter brace I showed.  The clamp pieces are 70 percent glass fiber and quite strong, the screws are carbon fiber reinforced and the rail is also a glass fiber reinforced plastic.  It is quite strong.  You might have a problem if you used the entire length as I did in the pics above but for 3-4" no problem.  The key is too have it cut right so the vertical drop is against the pane and given some support .  Also, the Streams may be a problem if angled strongly, but at a straight 180 from the bracket it will work fine, otherwise it may be blown to the side.  Their are a few rubber dampners that help the holder grab and stay in place.