Can I add a 3rd HomePod mini to my speaker group

Hey OPhome,

Thanks for using Apple Support Communities. If you're asking about creating stereo pairs with your HomePod, you're only able to pair two of the same model as shown here: Set up a HomePod stereo pair - Apple Support

If instead you're wanting to simply play the music in sync to multiple speakers, these steps will help: Use AirPlay to stream audio - Apple Support

If neither of those are what you're looking for, let us know more details. The more details you share the better the community can help.

Take care!