The bottom line (I crack myself up

)is as follows.
Do not attach any shackles to the Cooper Anchor. Ideally, splice some 3/8th inch three strand line to it (hey, learning how to splice is cool, and very nautical

).
Have a shackle at the end of that line about 6-10 feet from the anchor.
If you want really good holding power, attach 3-6 feet of 1/4 inch or thicker chain, with as shackle on its loose end.
Attach your anchor line (with loop spliced on to its bottom end) to the chain shackle. The length of this line is up to you, but I would go for at least 50 feet. (if you attach a shackle to its UPPER end, you can add further lines as necessary).
Make sure the upper end of your anchor line is safely attached to your Island (don't laugh, I have seen the results of missing this step!)
As you might have seen elsewhere in this forum, I chose to have a 33 foot line permanently attached to my TI (very handy when launching and retrieving from my trailer) fed through an "O" shaped SS fitting on the bow, with retrieve line. I attach my anchor line to the end of this permanent line.
That should cover it...