You have your answer in your question. Family groups of 6-10. If you want to put out pulling power put out several family groups around your blind with a big hole right in front of the blind.Or string them out to look like several family groups. One thing for sure,don't sneak in early morning and shoot them off the roost or they will not come back. I know guys that only use 2-3 decoys for early season and kill geese!
There are still things worth dying for and 1 of those things is freedom.
I love Geese
Genesis 27:3 Now then, get your weapons, quiver and bow, go out in the fields and hunt some wild game for me.