I think (do not know for sure) both should connect to the covr like any other wireless network and you can use 2 in the same room.
From google:
1. Make sure that both HomePod speakers are in the same room in the Home app.
2. Open the Home app, press and hold HomePod, then tap Settings.
3. Tap Create Stereo Pair.
4. Choose a second HomePod to use as a stereo pair.
5. Tap a HomePod on the right or left side to identify it. ...
6. Tap Back, then tap Done.
https://support.apple.com/en-us/HT208807