[waydabber]

I don't think displayplacer is intended to create a virtual display, it seems to be a CLI to manipulate display modes and mirroring for existing display so these seem to be two different things entirely. I might be wrong of course.

[michael1999]

I agree. But the problem the OP had was forcing a video mode. The virtual display was a means to that end. I think displayplacer solves that problem more directly.