Question regarding Satellite Setup

I would like to implement a satellite setup that is using MQTT. Is it true that I an run another (complete) Rhasspy installation on a satellite system OR run rhasspy-speakers-cli-hermes/rhasspy-microphone-cli-hermes?

Ist there an example somewhere on how to run rhasspy-microphone-cli-hermes on a satellite system? The github page says “Records audio from an external program”. What could that be for example? (I want to have a satellite system that listens 24/7…)