Out of shelves, had to make do.
looks like they're just stacking on top of each other..... how are you securing them?
Judging by the photo, looks like white zip-ties holding them together as well as supporting the whole stack from falling over by zip-tieing them to the post...
Correct, zip ties. Lots, and lots, of zip ties. Then I have (near the top) a tie on each corner to the rail mounts. The antminers have lots of small holes along the edges, perfect for tiny zip ties. It's by no means secure, but I'd rather be mining until the shelves arrive in a week!