>setup
I ordered 2 Google Minis; one upstairs, one down. I set up a new, separate G account for them before I installed them. I did not provide a phone number on that account. After setup, I flipped the mic switch to 'off,' so they are only speakers --no voice control/listening.
On HE apps, I added the built-in Chromecast app. I then searched for devices and linked the 2 minis.
Once linked, they show up as a message output option on the Rule Machine. You just type the message you want voiced, tick the checkbox to designate the speaker.
Mostly, I added it for 21st Century fun, though I do see it useful for notifications or warnings that might otherwise go missed. Right now, mostly just for testing, when the outside driveway light pedestals go off or on, HE announces it. Same for when I pause the vacuuming shedules for the Roombas. Debbie sees more serious use for intruder alerts, etc., but I'm not as advanced as she is.
BTW, Louise isn't keen on it --finds it sort of a creepy nuisance. ....ESPECIALLY if I use a male voice.