Old PC that can be on all the time.

If you dont have one and want dedicated hardware, I would recommend a used server, or something you can whitebox (like using as asrock rack mobo that takes a desktop ryzen but supports ecc memory)

Put proxmox on as the host OS, two ssd’s in raid 1 is good for a boot drive / VM storage drive. Raid 10 if you want real high performance, but probably unneeded.

Look for a case that has a SAS backplane, and then connect the backplane to a HBA card. Pass this card through to freenas for storage shares and stuff.

I recommend not virtualizing your router. So, if you want togoet away from Soho gear, either flash a Soho router with openWRT, or build a separate box for pfsense or opnsense. If you go that route, you will need a separate switch / access point. Unifi gear has a good balance of features and affordability, and can all be managed from a single ui (let’s say you have 3 switches and 2 access points… You dont need to go to 5 web UI’s, its all in one spot - and you can self host the web ui in proxmox)