Going to share some of my posts for the original atom echo and S3R variants here…
I did a bunch of testing and eventually came up with a working config for the atom echo while using a streaming wake word in HA: Atom Echo works for a while after restart, but then stops responding - #18 by afloat5271
I also recently got my hands on the S3R. It also required some tweaking, but combining the m5stack yaml and my wake word snippet from this post seems to work well for an on-device wake word: Initial Atom Echo S3R impressions and optimizing the wake word config
Hope this helps!