Sonos discovery across subnets

Did you try setting up the configuration.yaml according to the doc? This is what I had to do and it works perfectly. Since you can reach your Sonos units from HASS via ping, I imagine this should be all you need:

sonos:
  media_player:
    hosts:
      - 192.0.2.25
      - 192.0.2.26
      - 192.0.2.27
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