Believe most prefer a fork mount for bikes on the roof...what I use. Saris is sometimes not mentioned but I have had great luck with mine. I use a Thule fairing btw :-) Check the website of any major brand for the rack that will fit your car. A suggestion is to buy off e-bay...what I did...if you can find a new one in a box or one only slightly used. If you pay retail, good racks are pretty spendy.
HTH,
George