It's an excellent alternative to drilling....it mounts with the a/c control bolts.
BUUUUUUUT...don't buy it from UPR...there's a guy on the Corral and here as well that actually made those a few years ago. UPR out and outright stole the design since the guy didn't patent it.
Try a search and see if you can find him. He sells them cheaper than UPR as well.
Email Scott from www.scottwinger.com. He knows how to get in touch with the guy.