For Spotify quality, utilizing your V90 DAC, the simplest, most inexpensive, expedient solution is a Wiim Mini. I use it in a 2nd system over WiFi with Qobuz at up to 24/192 into an external DAC through optical, controlled by the iPhone app. The interface is adequate, the setup is easy.
I do like the Bluesound app better. The Node also has a much better internal DAC than the Wiim so it may not be worth the trouble of connecting the V90. It also has more connectivity options for external DACs which might be helpful if you later decide to scale up.
I’m assuming your home WiFi is decent. You can hardwire the Node. I don’t because WiFi is more convenient for me, and the little LED showing the connection was bright enough to annoy me.
I’m sure there are better sounding solutions, but either of these is a good start.