The standards do have mounting hardware so they can be used in shallow water. I'm trying to load a pic of the mounts.....the decoys are in storage. If you are really interested I'll pull them out and get a pic of a shell with the mount.
Theses have never been out of the package and I'm going by memory. I believe the metal cross snaps onto the bottom of the shell and you sink the pvc into the mud and then insert the bottom of the cross into the pvc. Never tried this, I just bought them for field hunting.
If you still have these at the end of July and come to Woodbury, I may be interested. I'd rather spend the money on floaters right now after buying 58's silhouettes. But these would be handy to have.