I have the Cervini Ducktail Spoiler on my 2012 and the fitment is perfect. The over all quality is phenomenal and if you do get it painted through them you will not be disappointed in the color quality as well.
I've had zero issues with mine and it is taped down with 3M double sided adhesive tape.
side skirts, spoiler, rear valance, tonneau covers, styling bar,quality is awesome, however customer service stinks, waited 4 months for bar, the covers arrived with a ton of air bubbles, they replaced then but 12 weeks just to get them to shipped. Calls to the are useless, they apologize a lot ask for just another week or too.