If you want aluminum to avoid any fear of some rust, the Racktime racks are well built. I bought the Racktime Addit for my Lynskey.
Yes, I know it is not quite horizontal, I was making some adjustments to lower the rack a bit, put some clear plastic tubing to protect the paint, etc., and was rushed to get a couple photos before the sun set. The angle was adjusted soon after the photo.