There is a local club (The Stone Church) which has low ceilings. Probably 3m (9-10') high. Hundreds of tapes have been made there, and almost everyone has settled on a common setup. I've tried a few different things, but always come back to that. It works well here anyway, and that might translate to you. Down the center of the room is an overhead steel I-beam, and we clamp to that. That's one advantage to a low ceiling... you can reach it standing on a chair.
With T-bar's, apparatus, etc, the average set of mics are probably 18" (~50cm) below the ceiling surface, which means "half way between the ceiling and the top of people's heads". We are probably 12' from stage. If you put your mics at 90* DIN, the mics are pretty much pointing at the stacks... a little closer than the usual sweet spot. If you move back from there, it get's chatty and boomy really fast. People use cards or hypers mostly to reduce chatter and room reflection. If it's a nice quiet sit down show, occasionally someone will use subcards or (rarely) omnis, but cards & hypers are the norm. The PA is mono, or at least stereo mixed up the middle. The best way to get any sense of separation is to run DIN'ish - NOS'ish, at least you get some time separation.
No magic bullet, just the basics.