I sandbar my 20ft toon a lot and when not on sand, it's in about 15ft of water in a cove.
Box anchor off the bow facing out toward the waves.
Fluke anchor off the stern facing shore.
Drop the box, give it a lot of scope, back up until it bites in (or walk out and jump up and down on it when really shallow).
Once the box is set, toss or walk the fluke out the stearn until it has scope, then set.
Eventually, I am looking to replace the fluke with one of those dent puller styles you hammer into the sand.
Edit: that digger does look nice.