I take it you mean Tom’s homemade AFB. I don’t hang but I’ve put down a few thoughts that may be useful (or may not).
If you can hang sitting down then do. If you prefer to stand then stand. The AFB has a few nasty sticking out bits that would seems to make it harder to find a comfortable position but even with that limitation you should be able to do most things people do with bibs. I guess you have to watch out for twisting and OTS and BTC may be harder but hanging straight down on the edge of a chair or standing should work you may even be able to get interesting angles by placing the hanger on the edge of the chair.
Hopefully a seasoned hanger will add an answer to this.