I know I'm a bit late here but I tried that exact fake set of canards. They will be fine if you keep it under 100. When I first got my car I was in a hurry to throw something different on it and after only having them for a few weeks, one of them flew off in Mexico at high speed. I'd check on it periodically to make sure it's sticking and consider reapplying tape every once in a while.
Hey, can you confirm that the bolt/nut set attaches the back tab of the canard to one of the open grille cells? If so, can you tell if the hole lines up to the cell?
If I put these on, I want something mechanical to assist the 3m tape. You know, for when I come off track and find the canard dangling in the paddock.