Is there any good way to make a big wardrobe as a mezzanine?

The best way to make a wardrobe with a mezzanine is to do it yourself:

You can use two stainless steel angle steel, plastic or aluminum alloy, drill two small holes according to the length, then fix them on the two walls of the cabinet with screws, and then put a piece of wood, glass or rubber plate on it, which is better than a good ruler. This is a shelf.

Very convenient.