What I believe you are after are known as "platform racks". With platform racks, the bike tires sit in trays similar to a roof rack. Some of the better ones are the Thule T2 (as mentioned above), Kuat NV, Saris CycleON, 1upUSA (my favorite but out of my price range), and the Yakima Holdup. IMHO, ANY platform rack is going to be better than the "hanging" style racks for a number of reasons.
'04 GMC Sierra 2500HD, CCSB, D/A, MaxBrake, B&W Companion, Retrax Pro, AR Power Steps
2013 Rockwood 8289WS w/Diamond pkg
1969 Camaro RS/SS Convertible
Dad's old 1968 Empi Imp (recently recovered from under 21 years worth of boxes/dust)