I saw an example of someone ordering objects in an isometric game very well. They used the Iso Grid 2 object, but the code for object order was super complex and used 3D arrays and the like.
I'm wondering if there's a much simpler solution to making objects appear on top of or beneath other objects in an isometric design already coded for "Sort by Alterable Value decreasing." Of course, that works fine for everything being on the same plane, but if a player and/ or maby other objects would be above in "Z Axis" the height level of a prop like an active object resembling a crate, or standing on top of it, it'll show the object behind the prop when it's actually supposed to be on top of it.
Moving objects to different layers came to mind, though it sounds like it would be difficult having so many layers representing so many different possible platform levels and heights.