If possible, setting the cages next to their usual rabbit neighbor from your previous set up, will help too (if this is how they were set up before and aren't bonded pet rabbits). Provided they actually liked who they were next to before.
If they're bonded pet rabbits, just keeping them together, and maybe giving them a box to hide in if they don't feel safe, or partially covering the cage with a towel or blanket, but leaving enough uncovered for airflow. Also make sure they aren't sitting out in direct sun, especially if the temperature is warm at all outside. And frequently check on them, especially if it is warm, and make sure they aren't getting too hot or too stressed.