{QUESTION} multiple streams to several devices

[IIIdefconIII]

HI all i was wondering if someone know how i can setup this:

Does any one know hor if can get another playing stuff on my notebook seperated from my avr or shield?

type: horizontal-stack
cards:
  - type: custom:mini-media-player
    entity: media_player.spotify_iiidefconiii
    group: true
    volume_stateless: false
    toggle_power: true
    artwork: full-cover
    source: full
    sound_mode: full
    info: scroll
  - type: custom:mini-media-player
    entity: media_player.spotify_iiidefconiii
    group: true
    volume_stateless: false
    toggle_power: true
    artwork: full-cover
    source: full
    sound_mode: full
    info: scroll

im not sure what entity i should use to replace the second entity

[IIIdefconIII]

EDIT ok it think im a BIT closer, it almost look like i need to isntall spotify 2 or does anyone knows the trick??
When i press play on the other card now it just removes the current stream output

type: horizontal-stack
cards:
  - type: custom:mini-media-player
    entity: media_player.spotify_iiidefconiii
    group: true
    volume_stateless: false
    toggle_power: true
    artwork: full-cover
    source: full
    sound_mode: full
    info: scroll
  - type: custom:mini-media-player
    entity: media_player.android_tv_10_3_10_13
    group: true
    volume_stateless: false
    toggle_power: true
    artwork: full-cover
    source: full
    sound_mode: full
    info: scroll