I followed the instructions for xrun here, in this thread, and while it works, the scaling is all off.
Since I'm using an Nvidia MX150, I figured that there's no real point in messing with scaling and all - I'm not going to run games at 1080p anyways because I want good performance. Instead, I could run my tty2 (on which nvidia-xrun is ran) at 720p. The question is, how? xrandr -s 9 gets me to 720p, but NOT in nvidia-xrun (which doesn't surprise me, since one is driven by my UHD620, and the other by my MX150).