How to setup multiple google home devices

hi, i like the google assistant / home devices, so i want to buy a second google home mini device for upstairs
but how to configure this correctly? for example

i have 2 mediaplayers in my HA config
downstrairs, i can now say to my google device : hey google, radio on
then my music starts playing
for upstairs, i obviously want to say, also : hey google, radio on …
but another mediaplayer needs to play the music?
how does this work? is it enough to put the google device in the same room ? so if i speak to the device upstairs, it only starts the radio that is configured in that room, and not the other room?

i dont want to say, hey google, radio upstairs on

switch.radio1:
  name: Radio
  expose: true
  room: Downstrairs
switch.radio2:
  name: Radio
  expose: true
  room: Upstairs

Can you not allocate the google home to a room within the google home app (say, upstairs), then say ‘hey google, radio on upstairs’?

I don’t want to say upstairs or downstairs

you need to explain what you want a little more clearly as the way Home Assistant communicates with Google Home / Assistant is rather specific. You can ask a Google Home device to play music in the room that you ask within (as you have said above) without any interaction with Home Assistant at all.

So:

What radio are you referring to?
What device do you want the music to play from?

More info is required, but yes, you can allocate the Google devices to rooms within the Google Home app (no need for Home Assistant here) and you can therefore ask the Google Home to play music in that room without saying the room name.

Ok, some little more explanation:
I have a media player entity, it’s my Denon receiver…

The receiver is capable to play to different zones in my house, zone 1 , 2 , 3

So now I have 1 Google home device, if I say downstairs : music on, media_player.zone1 starts playing…

Now I want to say upstairs also : radio on , so same command without telling the room I am in…
Then media_player.zone2 needs to start playing…

The config in HA is verry easy for this, just 2 switches that I expose to Google…

But I want to be 100 sure if I say : radio on to Google device 1 or 2 that the correct zone starts playing , with the same command… So is it enough to place it in the same room?

Because with lights, if you have for example 2 lights With the say name as a test, if you say : kitchen on, the Google devices answers with, ok , turning on 2 lights…
That’s NOT what I want

Little up here if anyone found the solution ?

I have multiple google home and when i query home assistant with custom script and data template, i want to answer on the same google home i asked the question :).
Is there a way for home assistant to know on which media_player answer ?

Thx