I have a couple set up on buzzer bars and 1 on a single stick, like Greeksi... The buzzer bar is handy as some waters are 2 rod only. If I use a third rod, which isn't often, then the single is placed somewhere to the side, giving me a bit of room in the swim, and usually fished down the edge, out of the way of the other two rods. This works for me, helps when landing fish, and less likelihood of all 3 getting wiped out at once by a fish,swan etc It's always handy to own a pod of some sort for when the ground is rock hard in the summer months, or if your water will accommodate stage stands, they too , are a good option when the ground is hard........ Rods don't always need to be perfectly aligned like a mag shot, fish the situation that is in front of you. Singles are best imo, but you can't always get away with it depending on your swim and how hard the ground is.
I think, in the main, it is largely a personal thing whilst the ground is soft.... Once it becomes rock hard, then the pod gets a run out for me.