FWIW, I was looking at these about a year ago, but decided against it due to a number of reasons, the most important being that my house builder told me the floor wasn't stressed for it. However, I was looking at this Gemini lift:
http://www.geminilift.com/gpo9A.htm
I looked at several and this one has a minimum pad height of 4 inches, which would just barely fit under both the Cobra and the wife's Miata.
One other item of note. I have a 10' 6" ceiling in the garage. The standard dimension of this lift is 11'11", designed to fit under a 12' ceiling. I did talk with the manufacturer and they CAN make it shorter, for an additional fee. The additional fee is due to the fact that they have to manufacture some non-standard parts for both the side supports and the cables connecting the two lifting arms. I'm not sure how much the additional charge would be. They also have a shorter design:
http://www.geminilift.com/gp9F.htm
This is designed to fit under the shorter ceilings, but the price is that the cables run along the floor as opposed to overhead. Some folks don't want the area under the lift obstructed by this channel. Maybe this helps some.