Thanks for the insight on the stake anchor, which I realize is a slide hammer. I want it for one purpose only and that is to keep the stern from swinging around when I have the bow anchored with my Danforth in tight areas with other boats in swimming areas etc, close enough to shore that it is staked at the beach.
As far as your conversation turning to the box anchor I would not even consider using that anchor for anything other than what they advertise it for, which appears to be again, in harbors where there is alot of congestion, other boats and not much room. I would never consider such an anchor when I could use my danforth, AND NEVER overnight.