If Genelec SAMs, or other active speakers with an AES/EBU input are an option for you, then I find this works well between a Windows PC and the Genelecs SAMs: https://rme-audio.com/hdspe-aes.html
It's got 16 AES/EBU outputs, but I've only used 6 of them, so can't comment on the >8 channel...