FTTP upgrade and confusion over device layout

Hi All, hoping to get a little advise as i'm struggling to get my head around my potential setup and if i'm right in feeling like an upgrade to FFTP is no janky. At present I have 2 computers and a mini pc serving as a NAS hooked up to my modem, all wired via ethernet in my office.

If I'm understand this correct my FTTP box will be installed in my living room (behind my TV) I would then need to have the router coming off of that. I would then have to have my mini pc and its hardrive connect to that router as well, and my PC's would connect to the router wireless from the office.

Is there a way to keep the mini pc in the office as i occasionally have to connect a monitor to it. It just seems like I will have all these devices taking up space behind the TV as apposed to how all my computer items are currently tidy in/under a desk.

I appreciate any help/advice on this as its been getting confusing working out what is what.

Cheers,