No rails? No problem. The new BaseLine tower from Yakima is designed for bare/naked roofs. 

• Secure, easy-to-use tower specifically designed for cars without roof rails or gutters
• Advanced tower architecture is sleek, strong and quiet
• Works with all Yakima crossbars
• Tri-axial DropHook™ clip adjustment easily adjusts to a wide range of roof shapes for safe, secure hold
• BarBed™ has 12° of pitch adjustment to optimize tower position and level bars on rounded roofs
• Easy installation – tool included
• Maximum load rating of 165lbs (75kg), depending on vehicle and bar rating
• Locks to you vehicle with Yakima SKS lock system (sold separately)
  
• The RoundBar SL Adapter is required for using Yakima round crossbars with the BaseLine (sold separately)