Pre-Login Screen Resolution Bad

So, I’ve got 3 monitors, one gaming monitor and 2 monitors I found in a trash years ago. When I get to the login screen, my main monitor is fine (usually is by default) but my 2 side monitors are showing a gross 640x350. Usually, they show this resolution by default.
At one point, I attempted to use xorg files to fix this (in a past EndeavourOS install) and I put this line, for both trash monitors:

Modeline "1024x768" 75.03 70.07 60

… Now some may ask, why those numbers? Idk, it’s what came up in xrandr. And some of you can tell, it’s probably very wrong, and I can assert that it is wrong, because my EndeavourOS couldn’t launch a graphical interface. OOPS.
Also, where would I put this info in Manjaro? I’ve heard that I need to put it in /etc/X11/mhwd.d/nvidia.conf, but does order matter?
(Also, how do I make it so I can type my password into my main monitor? It defaults my trashy one rightmost. Probably cause that one is “Monitor 1” somehow)