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I was running 5 from an Airport Extreme and we would get some problems when we had a few guests who have our wifi password (i.e. parties). It has been a lot more stable since we changed to a Ubiquiti AC Pro.
You're right though you should be fine with one.
If you don't get on with them you could make a Raspberry Pi with an audio hat running Ropieee and connect it to any kind of speaker. I'm using 2 of those hardwired to the network and they are great even at 96/24. They will work over wifi but probably best to stick to 44/16.
Cheers. You can get refurbished ones for under £100 so I've picked one up to give it a try. I have a wifi AP in the bedroom at the back of the house so no bandwidth issues.