I prefer straight runs on gas. It's just less measuring and fittings. You can use plumbers strap to hang it with.
Though really, it's not much difference either way. I don't think there's a wrong way here.
Keep plenty of oil on the pipe while the cutters are doing their job. You should have a pan with screen, so the oil drips right down back to the pan. Not enough oil and you start ragging the threads.
When the end of the thread cutter meets the end of the pipe, you can flip off the cutter tension and release it.