Just to be nitpicky, very few routes are really "top rope routes". Many routes have bolted anchors, but that doesn't make them top rope routes.
You can do a number of things - either a pair of quickdraws, or a cord- or web-o-lette eqalized is fine. The important things are to avoid TRing through the rings themselves, and to leave room for another party to rap through if they need to. There's a really nice solution in this Gunks.com article
, where you can pre-rig your rappel without actually TRing through the rings.