I think I found something that'll work!! I'm gonna take the measurements of the hatch tomorrow hopefully. Yakima recently came out with a rack designed for the Z. Check it out Boofsquire Although I worry about the clearance of the spoiler... And even better is the rack is temporary, easy on/off! But the downside is the weight limit.
Width Top - 52 inches
Width Bottom - 46 inches
Overall Length - 35 inches