OK your setup consists of 3 vertical monitors and judging from your photo the 3 monitors give you a 16:9 aspect ratio with a screen size of about 32 inches.
Solution: buy your self a dedicated 32 inch TV or Monitor and you won't have to worry about input lag, nor the convoluted setup you want.
you probably already thought of this but disregarded it, but sometime the best solutions are the most simple ones.







