This is how I store my spare Mantus anchor. It’s a scrap of plywood with some cleats glued to it. A couple of short pieces of threaded rod and a couple of homemade wing nuts and it’s a nice, compact, low profile package.
Again, this is my spare/storm/secondary anchor. My main anchor which is the smaller size Mantus sits in a milk crate behind my seat ready in seconds. I have not timed it but it shouldn’t take longer than three or four minutes to get the spare ready to deploy