I used stainless steel sheet metal screws at the 6 or so locations where the valance has cutouts working from the middle outward after centering it and removed the threaded nuts at the ends and went with 2 push-in plastic clips at each end like are used on the inner fenders. Got those at my local Ace Hardware. I found I could line up the outer ends and curve better with 2 fasteners in a row there since the curve isn't exactly the same as my bumper. I don't want mine moving at all and figured it will be hitting a few things since it's so low. I actually already had it scrape today pulling into a parking lot but it does bend.
