I went the other way. I tried laptops and raspis wirelessly, and then with audio over ethernet but the difference in timing caused by differences in signal decoding meant that you can couldn't sit in one room with the door open with the speakers in the next room also going because of microshift flanging (although I say micro, some rooms were over 100ms out of sync, which is unbearable).

What I ended up doing instead of just running TRS cables along the ethernet cables that were already going to the various rooms I care to spend most of my time in, with some 4x4 audio interfaces that take care of sending the audio to the various speaker sets in those rooms (for rooms with more than one set). Any interface's output can route to any other interface, so if there's more than one thing playing you just press enable that input in the room you're in, and done.

And of course, you can get the same done with some second hand professional audio routing rack units, but (a) those are rather inconveniently sized, and (b) you kinda need to have a hookup for those, or get lucky, whereas audio interfaces are a few clicks away and designed to at least look reasonably decent sat on a bookshelf =)

More expensive? Probably. "Perfectly" synced audio across rooms? Very much so.