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Multiroom with Shairport is currently not possible without further ado. You could try updating Shairport manually to make it Airplay2 compatible and then synchronise the players: https://github.com/mikebrady/shairport-sync/blob/development/BUILDFORAP2.md Unfortunately, I cannot give you any guarantee that this will work. It is also explicitly mentioned that this is a limited version of Airplay 2.
You can also send your music to the Squeezebox server either via cable (input from a HiFiBerry DAC+ ADC) or Bluetooth.
More about Airplay with Max2Play: https://www.max2play.com/en/how-tos/howto-airplay-with-max2play/