I favour the Maybelle Carter style against the left shoulder with crossed hands. If you play flat on a table you could have problems playing in pub sessions. Picture it: "OK everyone move your pints off the table while I give you four choruses of Red River Valley". Not a popular move. The upright style and crossed hands do allow you to get a good strum going for accompanying songs but if you stand up you need a strap and your knee on a chair. PS What is a fanny pack? Sounds filthy to me.