The best way is to use a deviled egg carrier (Amazon affiliate link). However, there is another safe way.  Lightly crumple a piece of aluminum foil and place it in a baking dish that will hold the egg halves in a tight single layer; they should not have the chance to move inside the container.  Cover them with another piece of foil, tucking it loosely over the eggs and not on top of the baking dish. Ensure that the foil doesn’t touch the filling, or it will squash it. Tuck the foil around the sides of the eggs but don’t let it touch the avocado filling.