Ok I clearly know very little about this, can you tell me why this is unachievable or give me some kind of other plan?
I want to have a quality audio system inside throughout my house as well as in the backyard through wall mounted and satellite speakers. Money aside, how would I go about achieving this while connecting all of them under 1 receiver?
Ceiling speakers in multichannel systems are for the Atmos height channels ONLY. Dolby specs for home audio allow for one, two or three pairs. For most rooms four tends to be best. So you have front height left and right, and rear height front and left. Dolby specs say that the heights should be in line with the left and right fronts, and the rear heights between the surrounds and rear backs.
So in a 9.1 system you would have front left and right speakers (not in the ceiling) and left and right surrounds, and left and right rear backs, again, NOT in the ceiling. There would be two ceiling speakers, although four is strongly recommended. The 0.1 is the sub, although two is generally better, so that would be 7.2.4 which is optimal is most suitable domestic spaces. I should point out that a lot of domestic spaces are not suitable for surround multichannel audio.
An outside systems surround systems make no sense, as there are no acoustic boundaries. If no TV, then a right and left speakers and a sub is best. If you have a TV outdoors, which is not recommended, then three fronts and a sub. The TV needs an outdoor rating and they are far and few between. Also, if you do have an outside system, then you need speaker drivers with an outside rating. So those installations are difficult, and cause friction with neighbors. I personally think they are a bad idea. If one of my neighbors installed one, I would be furious.
The other use for ceiling speakers is for background music, and they are usually powered mono. They also give your home the ambience of a shopping mall, if that is what you want.