Best is roof rack if you are tall enough to mount the bike up there ... and you do not need to drive into covered carpark or your covered carpark is high enough.
I'm using it now and feel safe driving with that setup at NSHW @ 110km/hour, going to coffee shops and good for unholy mess after muddy rides too (just need a big brush and 2 x 1.5L water in the trunk - Yes, you can have access to your trunk area!)
If have to use a rear rack, make sure it's sturdy, I used a rhodegear for years and never feel safe travelling more then 60km/h. After 3 years lots of scratch mark on the trunk-cover. Don't feel safe on normal road, NSHW or just having my dinner...
Best i had was a water-proof bike-bag, take out both wheels and put in the rear seat, feeling very safe makaning in coffee shops or NSHW @ 160km/h. Works with unholy mess after muddy rides, too. A New Zealand friend borrowed and never return though ...
