Scene to group speakers?

I must be having a brain fart. I recently added a 3rd Play 1 and for some reason the group of all 3 seems to lose itself regularly. I know with the TTS part you can set an ‘play all zones’ but that parameter seems to be missing when doing a PlayUri to eg one of the Sonos Favorites.

I rather not start adding join and play commands to my various Sonos scenes as I am planning to add 1 more Sonos and set them up up as 2 stereo pairs next time there is a ‘sale’.

As said, I must have having a brain fart. Looking for an easy way to create a ‘Group All’ scene or command I can run on a regular schedule to keep the trio grouped together. It looks like the PlayUri may do it but I seem to be missing the right syntax.