Hello! To hang the crates they’re going to be just like shelf or
anything that needs some extra support so you will need to use anchors screws.
The best way to know exactly what you need would be to go to your local
hardware store and talk to them about the weight that you are going to put
inside the crate. They will be able to guide you to the proper type of anchors
and how to do it. Thanks for reaching out!