Multiple Chromecasts forced discovery

Configuration
1

The docs say I can force discovery of a Chromecast specifying the host (perfect since I have set a reserved IP).
Eg from docs:
# Example configuration.yaml entry
media_player:
_ platform: cast_
_ host: 192.168.1.9_

But what about multiple Chromecasts? I have two in the household. Do I just tack on a name at the end of each?:

# Example configuration.yaml entry
media_player:
_ platform: cast_
_ host: 192.168.1.9_
_ name: Chromecast1_

media_player:
_ platform: cast_
_ host: 192.168.1.10_
_ name: Chromecast2_

2 
mediaplayer:
  - platform: cast
    host: 192.168.0.21
  - platform: cast
    host: 192.168.0.25

or

mediaplayer:
  platform: cast
  host: 192.168.0.21
mediaplayer 2:
  platform: cast
  host: 192.168.0.25
3

I will give that a try.

4

I use the first example if that helps. It’s just more neat.

5

I seem to be having other problems. I had a nice tabbed UI & seemed to have my groups all sorted out. Did something when I added my chromecasts that seems to have crapped the whole thing out.
Will start all over again from a copy of my last good configuration.yaml.