flat.
There was a period, but I think it just goes in cycles and you say a lot of people posting/asking, but you didn't hear from the people laying them flat.
I go for flat. If you hang them, how close are they go the heat? What about thick vs thin end, which end do you put up? What about all the fat dripping out / down/ up?
See, too many questions.
Flat it is for us.