A:AnswerYes, your Apple TV will airplay to HomePod. You go into Video and Audio in Setting and select the audio output to be the HomePod. It will also airplay to two set up as a stereo pair. Anything you play on Apple TV works this way (movies, Netflix, etc).
A:AnswerIf you’re asking if you can use 2 HomePods together to give you surround sound, the answer is yes. They will connect together and detect each other in the room so they can direct the sound in the room directly towards to.