If you are talking about during the steaming stage, for the cc's I just line them up in a brownie pan or glass baking dish (i.e. something deep enough to do the next step
, and place a cookie tray on top of said dish/baking pan, like a lid. After completely cooled, then lay plastic wrap atop the cupcakes (making sure the plastic wrap touches/clings to the top of each one), then wrap the dish in foil to seal out air, then freeze. You can also wrap them individually if you do it gently enough.