I'm no expert but I do not believe it needs to be done this way as the coordinates are used to place a particular "object" in 3D space using a possible combination of different speakers to do so. Dolby Labs provides recommended placement guidelines for both home and commercial setups of varying...
My take on home Atmos has been "If I build it, it will come." Based on that philosophy I built myself a 7.2.4 system and started ordering titles I thought would best exploit Atmos' potential. Some titles are objectively better than others today but I'm hoping future releases will begin to more...