plex stuck, with lags - help

@ChuckPA said:
An Intel i3-4130 will be an extremely nice step up from the 7 year old D510
You can safely run PMS on that i3 and do hardware transcoding of 720P and 1080P
Unless you are streaming more than 8 UHD BluRay movies, you will not need the 2nd ethernet port

possible that install PMS like a standalone OS on this PC?
also, i think i didnt ask good, i mean, can i connect the “new” PC (i3) that will be the PMS, with the Lan cable directly to the unraid system - that connect directly to the router by LAN, instead of connecting them both to the router?