I'll second the Qotom boxes. I use it as a firewall and run Sophos UTM Home. It's fanless and the integrated heatsink gets kinda warm to the touch but with some air flowing over it (ceiling fan) it works great.
I remember lan parties fondly. In the late 90's I worked as a computer lab technician. After closing all the lab techs would get together to play games. The most fun was playing DOOM with a 3 screen setup (Left,Center,Right) with 3 PCs per person. A sort of poor man's VR.
Those days are long gone but so very fondly remembered.