Ideally, use a tow tether or a safety ring built for your jacket.  Either option has a free-floating ring that slides smoothly along the quick release belt and is very unlikely to get caught on anything.  If you have to use a carabineer instead, make it a locking carabineer and make certain it is locked and the belt slides smoothly through the carabineer.  Both ropes are attached to the carabineer, ring, or tether.  Both ropes are used to position the rescuer by pulling or feeding line.  Avoid a vector pull scenario by setting a small angle, at most 90^o.  This greatly reduces the load on the two belay teams or persons.