Rasane Seto on Nostr: OBS has a plug-in that makes multistreaming as easy as possible. Zap.stream itself ...

OBS has a plug-in that makes multistreaming as easy as possible.

Zap.stream itself has native multistreaming though, if for any reason you either don't want to use a plugin or use XSplit lol.
https://github.com/sorayuki/obs-multi-rtmp