I have a Yakima Raptor rack and a Yakima Ankle Biter for my VX. The Ankle Biter came with a previous vehicle and I kept it when I sold the car. Both work just fine and attach to my Yakima roof rack. I prefer the Raptor, it is easier to attach/detach the bike and doesn't require the key/key lock like the biter.

I find the biggest challenge with a roof rack system is hefting the bike onto the roof and trying to attach it while holding it up. Easier with two people, but when I am by myself it is a bit of challenge holding onto the VX, hefting the bike, and attaching same to the bike rack. Probably easier to get a rear-mount rack.

If you do decide to go with the roof rack bike rack I do have extra aerodynamic mounting clips that I could be persuaded to send along if you need them.