Well hate to say it but you are using 2K wrong, it's an actual resolution. Check this chart.

https://en.wikipedia.org/wiki/4K_resolution

2K is the cinema version of 1080p , 4K is the cinema version of UHD. However the general public started using 2K to refer to the home version of 1080p and 4K for the home version of 2160p. Using them for anything other than the cinema variant is wrong, but oh well what can you do.

dual 1080p displays are just that, dual 1080p displays.

Measure height when you are talking about a number that ends in a i or p, width when talking about something that ends in a K.

I really don't know why people wanted to change from height to width, it's like changing the rules of a sport mid game.