Yes. The K-Lock. It at least slows the ones down that don't have pliers or wire cutters. Like most people in an office that did not break in. Why would the hinge get in the way when the k-lock is placed a good bit forward on even the classic (Front of DVD slot). Closer to the front than the back hinge. There is plenty of room. I am looking at a retina this very second.
I think the case is too thin to put an effective lock. It would need to be in front of the ports. I thought the lock was actually on the back hinge in the classics. If so then the lip on the top case gets in the way since it overlaps the hinge when the top is opened.