Make a bumper sprite that is as big as you want with a round collision (say 8 points in a circle) and make it invisible (or a see through color while debugging perhaps). Attach each enemy to a separate instance of this bumper sprite as a hierarchy. Make the bumper sprite a solid,
Every tic turn all bumper sprites solid, have them all push out solid in an ordered manner, turn them off solid. The order matters so you don't get flicker as they push first one way and then another. I think the one that is pushing out can't be solid so all but one get turned solid in the loop.
This kind of thing works for me.
yours
winkr7