Good luck with that one. I built systems for my kids only to discover they were happy listening to the speakers on their phones. After a few years one of them went all Hi FI on me with an $89 soundbar.
Regarding the OP the multichannel market was the big marketing ploy of the nineties and early 2000s. I myself am a multichannel fan and have two MC systems in my home in addition to my 2 channel system. However MC failed spectacularly in the marketplace. There is now an attempt to revive it with Atmos and also to simulate an immersive experience with headphones. My home won’t accommodate Atmos and I haven’t bothered to explore the new headphone technologies, but those who do and enjoy them will hopefully breathe some new life into Multichanel.