Using Sonos with existinf Crestron in wall speakers in house

I initially installed a Crestron system in the house when I built it. It's one unit downstairs in the utility room where all of the speaker wires congregate to. The Crestron can play in each room or in all. There's the living room, 3 bedrooms, and outside in the screened in porch. Over the years I have migrated to Sonos and have a TV in the living room with a playbar, 2 Sonos 1's and a sub. Another play 1 in the bedroom, and a play 5 that migrates between the screened in porch and the gym. I was wondering how I could integrate or setup the Sonos to be able to play through all of the room speakers or even ho to get the Sonos to play individually in each room via these integrated speakers in the wall. Your help would be greatly appreciated. I plan on using Alexa as well to stream music.