For the good speakers....(I often just use PC Speakers in like the two sheds and such,) I have external Bose, Yamahas etc in the more 'serious' zones....I buy $20 car/motorbike amplifiers off eBay from China that are hooked into the AExpress'. Works beautifully. (Other then the fact I put more effort into hiding the extra cables.)
In the ceiling I have the option of using the one AE/amp solution over multiple rooms, but would love to find some ceiling speakers that bypassed the need for this amp in between.
I'm covering places that are spread over about an acre, hence so many AE's. The in ceiling zone idea is really just bringing the internals of the house with the rest of the property in a more logical fashion.