Actually, a better way to do it is to not use containers. Use one text object, and create an instance for each enemy, and give the text object a private variable where you set the UID of the enemy its supposed to hover above. Then for each enemy, check if the text object's variable equals the enemy's UID and place the text object above it.
This is better than containers because this way you don't have to have a separate text object for each enemy - you only need to have a different instance of one text object.