Anchored or trolling. Or not anchored is the key. It makes a difference. You can spider rig with three poles. I get into this debate while on the water with old bridge fishin guys who have no clue. All they know is how to fish the bridges and nothing else. Then they want to try and tell me how I can fish. I just ignore them. They don't have a clue. If they did they would fish more than just the bridge. It don't matter to me, y'all fish how you want and I will spider rig with three poles like I have for years.