HomePod mini
Can I use more than 2 HomePod mini’s on my Apple TV 4K as a surround sound?
HomePod mini, 15
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You can pair two minis and send the stereo audio to them from the Apple TV using the Home app. But only two.
See:
When you set up home theatre with HomePod, you can enjoy Dolby Atmos, Dolby Digital 7.1 or Dolby Digital 5.1 surround sound.
Pair two HomePod mini speakers or two HomePod speakers in the same room to create left and right channels for an immersive soundstage. You can create a stereo pair when you set up HomePod in the same room as another one or later in the Home app.