Hi Raminjan, I was just able to stream two pre-recorded videos on my YouTube channel, I'll share the how-to.
I chose VPS rather than dedicated server since it's more economical, and what I did was just running two instances of OBS following this guide:
https://obsproject.com/forum/resources/obs-and-obs-studio-portable-mode-on-windows.359/.
Then I schedule two streams on YouTube Studio, copy the keys, and paste them into the OBSes. I'm using 8 cores VPS with 32GB RAM, when I open Task Manager, it says 99% of CPU are being used and fps are around 20 fps on both of the OBS, but they stream great without any problem.
Hope it helps, and yes I'm still trying to find a way to stream more than two videos on one channel. My question now is how to run the 3rd OBS, so if you or anybody know how to do it, it would be very helpful. Thank you..