Those are interesting, I hadn't seen them previously.
They seem to be an outboard version of the standard stanchion mounted bullseye fairlead. One thing we've talked about, is the friction that these introduce when the line passes through them and bends around at an angle. Bullseyes seem to work best at keeping a straight line captive.
Give us some feedback as you get a chance to test them out. Thanks, and nice install, by the way.