Your best bet if you don't want to go with a hitch mount and can't put it in the trunk is to get a rack for the roof, they are pretty expensive. Thule has a pretty good one but I think the pedestals alone are around $190 then you have to get the cross bars and the bike rail. It ends up being almost $400 or so. Yakima also has one and the pedestals for that are $190 as well. Just look around though, those are prices from carid.com so you might find them cheaper looking elsewhere.