How to array 2d skeleton characters vertically?

Hi there, I'm developing a tower defense game with Unity 2D. I'm using Bone Animation Tool to move characters, and having trouble with arraying objects(each objects(moving monsters) have about 10 bones) when it's moving up and down in the game scene. When I Array objects based on Y-axis to arrange the order, I also have to array bones which belongs to it's object. I think it's not a proper way to deal with, and I'm stuck with this issue. If you have any idea to solve it, please share! Thanks.