You should look into Logitech Media Server (open source with community forks/support). You can install it on your NAS, I have it on a synology. It also support

You should look into Logitech Media Server (open source with community forks/support). You can install it on your NAS, I have it on a synology. It also supports syncing music with multiple devices at a fraction, if any, of sonos or similar costs. There is a plethora of plugins available including an AirPlay bridge to stream to your Apple tv. You can use the excellent iPeng app (paid but recommended) as a phone remote (and even a source with an IAP). I use the LMS ecosystem to stream from my NAS to my linux workstation (using squeezelite), to my tv/speakers on an nvidia shield, to my phone via iPeng and to another chromecast.