Not sure if you seen these or not, there's another player for louvers, just found out about these about a week or so ago.
Got it from IKON Motorsports, fitment wise as it sits is pretty good (just sitting on rear glass), attaches with plates/bolts (9), is removable and cost about 1/2 what Zakustech's.
It is made out of poly and looks it, think I am going to use a textured paint on it just to be different. I also have a VIS hood and have no complaints.