Sorry, I don't do a lot of home automation. I have 3 TP-Link smart plugs
and GH turns them on and off just like Alexa does. You might want to visit
the Google Home Product forum for help. I know GH does groups and routines
are coming soon. Maybe you haven't quite figured out how to implement it? Someone on the
forum below can help. There is also a GH Reddit forum but gee, what
a weird forum with weird rules and aggressive people
When you say "groups" do you mean grouping your Google Home devices together
so they will play in unison? I have 2 groups. One plays on 3 GHs and one on 4 GHs.
Mike, here on this forum, has multiple GHs and does a lot of home automation. Maybe
he can help.
https://productforums.google.com/forum/#!forum/googlehome