You can have both wifi and ethernet. But you need to choose the default connection. So yes you can use only 1 at a time. Peer to Peer is bridging. That's the traffic going from your router->tower->laptops/portables. But there is zero reason to do that since you have a router.
If you are trying to increase bandwidth on a single computer by using both wifi and ethernet (called Aggregate connection), then no, that is not supported on windows 10 directly. You have to buy specialized hardware and run multiple lines. Most consumer motherboards with two nics do not support aggregate connections. The second port on consumer motherboards is made for bridging or to act midpoint somewhere in the chain (ie: Firewall) (Disclaimer: Someone correct me if I'm wrong. I haven't tested a lot of these dual port motherboards. But the general consensus is they are worthless.)
Do you really need that kind of bandwidth? By default your limiting factor is usually your WAN internet connection, not you LAN. If your connection isn't fast enough to consistently use your SONOS for streaming Spotify, then you need to set up QOS. It will ensure your spotify data gets through at a reasonable rate. However your entire network throughput will drop on most consumer grade routers.
Not all Internet traffic is equal.
www.howtogeek.com
https://en.community.sonos.com/troubleshooting-228999/qos-and-media-streaming-14088