A while ago, I wanted a way to mount 6 monitors, and, being a college student, wanted to do it with scraps. Below is what I came up with. The cable holds the whiteboard in a curved shape at the top, while angle brackets do the same at the bottom. The monitors themselves are attached with screws in the back. The final result is not unlike a certain $700 one on Amazon, but cost me half of a $6 sheet of whiteboard and some scraps.