Help with Hood Scoop Install

I had one of the older style Pro Stock hood scoops that I had molded into my fiberglass hood. I took it to a body shop and had them cut the back lip of the hood and slide the flange under & then mold it in top and bottom. They did and excellent job & matched my paint perfectly. I realize yours is a steel hood and a fiberglass scoop, I'm just putting in my .02 about molding it in from the underside. I've seen too many scoops molded in from the top, & every one starts cracking around the seam on top side.