I installed Channels DVR along with the Beta and Alpha versions of the app and was able to stream 3 live channels while also streaming a race on FloSports. This is hitting the limit of the Quest 3's capability (I couldn't even make a screen recording) but it works great.
@tmm1 can we get a few APKs with different identifiers for this use case? Currently you have the beta apk available (which can then install the alpha) but the Quest can handle 3 instances of the app and I'd prefer not side loading the Channels DVR apk that can be found on 3rd party websites.