I am with fasteddie. For an anchor I use my knuckles on my jawbone, string just touching the tip of my nose, kisser button in the corner of my mouth, and align my peep sight with my round sight guard.
Kisser buttons come in multiple forms: big, small, and really small.
If I had to chose one over the other, I would go with the peep sight, but I wouldn't go with just one.
Genesis 27:3 Take your bow and quiver full of arrows out into the open country, and hunt some wild game.....