It would probably be fairly safe if you put it on the ground around the hives. I have seen my bees land on the ground around the hive but only very few of them.
It probably wouldn’t be all that effective against mites or hive beetles though IMO. Hive beetles fly in so they would be landing on your hive, or landing board. And mites mainly reproduce in the hive from mites your bees already have on them. If new mites get introduced it is usually from transmission from other bees in the area not from walking into the hive.