Originally posted by Meewec:

haven't tested if it still works but last time i played i did this with my hives

https://steamcommunity.com/sharedfiles/filedetails/?id=2430607613

This works even better if you put staircases all around the platform so there's always an easy way up; ground-based mobs have the same issues with attacking at vertical angles that we do, and thus can not attack the bees if they're walking on them... with certain exceptions, such as the trolls' overhead smash attack.