I have four monitors. Two slightly angled directly in front of me, one angled on the left and a small 10 inch directly below my two main monitors that I use specifically for discord and my friend's chat app he's working on.
Why two directly in front of me with the split in the middle? I only have to shift my head slightly to move between the game I'm playing and whatever I'm watching.
But it's more useful when I'm working on pixel art because I can have my drawing on one main monitor and my reference in the other while having a show or stream on the secondary angled on my left and chat stays on the small monitor.
As for if that helps productivity, I have no idea.
But I sure like my setup now.