I believe all of them have a "picture by picture" mode where left half shows one input and right half shows another input. You could achieve what you want with

I believe all of them have a "picture by picture" mode where left half shows one input and right half shows another input. You could achieve what you want with 2 cables. But I haven't felt the need for such use. I use Microsoft Powertoys to tile a 16:9 area in the center and two half width areas on the sides and I am very happy with that setup. I am sure linux window tilers have even better capability.