Hey dude. I'm not sure if you understand that if you put Plex Media Server on your pc that it can still function as a regular computer.
Instead of running around the rim of the pool wondering how to swim. Jump in. Or wait until gramps tosses you in.
Being 100% nice and 30% funny here. I tried OpenNAS and it dedicated the whole computer as a media server.
Look at the HCL for Plex. See if your pc has the "oomph" for it. Remeber. Kodi started out as XBMC.
But the bottom line is if you live in the USA, beware torrents ANYTHING. Unless you already have a VPN.
And sure. I use wired Ethernet as much as I can. If all of your wifi stuff is crammed close together....no wonder you mention interference. Spread it out.
My wifi works pretty good. I have Ethernet/otg adapters for Amazon streamers here. They work alright where I have cat cable close by.
I live in an old old farm house. Who wants to string cable in one of these?
But also have repurposed DD-WRT routers setup as repeaters, client bridges. No biggie. Jump in.