Only one Sonos unit must be wired to the network, so if you can do that with the Sonos CONNECT (was ZP90) you're good to go.
Ripping to FLAC on a PC, most folks use dbPowerAmp, MediaMonkey or Exact Audio Copy, dbPowerAmp is supposedly the easiest to use.
(P.S. You'll likely wany a 2Tb USB disk for backup, losing a lorra, lorra rips would bad :doh🙂