The Swagman XTC2 TILT Bike Rack for 2 Bikes - 1-1/4" and 2" Hitches - Frame Mount # S64671 has a 3" shank rise, so a lot of this depends on how tall your bikes are since you'll be securing the bike by the cross bar; as long as the cross bar of your bike is taller than the spoiler it shouldn't interfere.
If you're not going to clear the spoiler you can go without the Curt Cam Buckle Stabilizing Strap for Hitch-Mounted Accessories # 18050, as Curt no longer requires the stabilizer strap... view full answer...