I've found that I actually really like using rotated 9:16 portrait mode monitors for writing code in a dual or triple monitor setup. It's very helpful to be able to see 80+ lines at a time.
But 1080x1920 is stupidly narrow. On 1440x1920 (4:3) you could place two windows side by side without much effort. It barely becomes possible at 1200 (16:10), though not with the font size I'd be long-term comfortable with.
