Does the capture system work with L plates?
The Capture Clip requires its own plate be mounted on the camera in order to function, but they offer those plates in AS and RS2 formats. I'd imagine you'd need a specialty built L bracket, which they don't have in the arsenal, yet; although it wouldn't surprise me if they have one in the works.
Depending on the bracket you already have, you *could* screw the CC plate onto the bottom of the L bracket, but that seems awful clunky to me. In the case of those brackets, I'd hold off and see if they put one out sometime over the next year.