So the one I have now does not have metal hooks, but what seems to be hard plastic tab hooks that cling on the top of the spoiler and the sides of the boot. now im not so worried about the ones of the sides, but the ones at top by the spoiler makes me worry with the weight of the bikes and gravity, it will put added tension to the hook tabs. These shouldn't damage the spoiler body work would they?
for precaution i was tempted to buy some vinyl wrap and layer up where the tabs would go for added cushioning and protection for peace of mind.
I suppose the only way to test is, is to try it out!