They hook around the fender openings and around the valance below the front bumper, as I recall. I looked at a Quad to purchase and it had one - you have to unhook the top S hooks to open the hood.
That being said, you should know that if you use one of these and leave it on all the time, it will damage the paint under it because it traps water between it and the paint it covers. I did not buy the Quad I looked at, in part because, while it had a beautiful and expensive repaint job, the paint area under the bra was severly damaged and the entire front of the car needed to be repainted back to the doors; thanks to that damm bra. I would never use one of these unless I was driving a long trip and could remove it as soon as I reached my destination. A car bra should NEVER be left in place constantly.
Robert Hill in Memphis, TN