So I ended up getting the Thule Force XL (accessories are 20% off right now through Subaru), but I’m not sure exactly where to position it on the roof. Obviously it needs enough clearance for the liftgate, but should I try to avoid covering the antenna as best I can? That would place it far enough forward that it just about lines up with the front end of the moonroof and the front edges of the roof rails. Is that too far forward? The instructions say nothing about north-south placement. Thanks.