there's several threads on here but I'd fire this one up too
Thule T2 or Yakima Holdup.
I had both but I woulda preferred the Yakima but it didn't work with my pickup's fold down gate. Yakima is lighter, smaller footprint, and the hitch attachment has no play. Yakima comes with a great lock too that locks bikes and rack to the hitch. The opposite goes for the T2 but it pivoted down lower. It adjusts one position down and then it can even drop down to the floor almost removing this safety pin which is great for loading big things in the bed of my truck. Since you're shopping for a car. If you plan on keeping bike on rack when you access trunk, you may have issue with trunk gate hitting bikes. If possible, you may consider try then buying.