With vMix Obsidian build supporting up to 24 HD inputs, I think it would be cool to be able to split the multiview over multiple screens.

Right now the maximum supported inputs on 1 multiview screen is 14, and in that case program and preview windows get really small.

When using external outputs, the latency is too high to work with, so it should be able to split the multiview over GPU outputs.

Another solution might be to have a few more layout options, so the multiview can be spread over a 4K screen, but I think multiple screens might work out better.

My GTX 1080 has 5 outputs for screens, and it's no problem to use them all simultaniously (1x vMix Gui spread over 2 screens, 1x prg out, 1x multiview, 1x windows desktop), without any huge performance issues.