I had a Yakima hitch rack that held the bikes by the wheels. Best dang rack I have ever used. New car has no hitch so I sold the rack and picked up a Yakima King Joe 3-bike trunk mount. Works like a charm be it one or two bikes. Won't haul 3 bikes cause ain't enough room between the bikes to minimize rubbing.
Mounts to the car in less than a minute and hold the bikes nice and secure.