I just set up a Raspberry Pi with PlayoutBee.
I got A RPI 4 B with 8 GB SRAM and the Argon One M.2 case.
It was pretty easy to set up. Even Copying the SD card image over to a 12 500GB SSD.
So it now has lots of room to handle more video files than I can keep track of. I have it connected to a BMD ATEM Extreme ISO.