No plan to have passengers back there.
Gotta ask why you got a QC then...? lol
FYI, the 2010 and 2009(I assume...I have a 2010) rear headrests are lower than the 2011+ ones. You could find a used set on ebay or junkyard, or buy from dealer....I have had no issues with mine.
As for the front headrests, they hurt my neck (I'm 6'4" if that matters)...I reversed them and they hurt that way too....I think eventually I'll buy rear 2011+ headrests for the fronts....see if that works out.