Option A would be the recommended layout.
Most Dolby Atmos mixes only use front height speakers as a blend of 2 other inputs (Fronts & heights) in audio transition only, so mixes utilizing front heights exclusively are far between. Most audio engineering mixes take advantage of the .4 above more so, even if the mix only contains a .2 mix, it will blend (audio positioned) across all .4 speakers, giving you a more immersive overhead sound coverage. The 6.5ft above MLP will provide a good ambience, furthering the ‘above you’ audio experience without the pinpointing effect of where it’s coming from exactly.
As far as the rear speakers, lower them, targeting ear level of MLP.
Forego any thought of .6 for heights exclusively(tops), as you will have the same effect of only having a . 2 system, as the audio engineers use that more so than any .6 mixes.
I’d recommend reading some of the Dolby Atmos threads and the mixes most movies are coming out with that the audio engineering are doing before adding a bunch of speakers and cost to your system. You may find that you have a much better system audio wise than most movies take advantage of as the audio engineering was not done to take full advantage of systems some of us are running. This only leads to you being disappointed in audio quality in the end after having spent a significant amount of time a money into your system only to learn later that you might have been better off with less.
Most Dolby Atmos mixes only use front height speakers as a blend of 2 other inputs (Fronts & heights) in audio transition only, so mixes utilizing front heights exclusively are far between. Most audio engineering mixes take advantage of the .4 above more so, even if the mix only contains a .2 mix, it will blend (audio positioned) across all .4 speakers, giving you a more immersive overhead sound coverage. The 6.5ft above MLP will provide a good ambience, furthering the ‘above you’ audio experience without the pinpointing effect of where it’s coming from exactly.
As far as the rear speakers, lower them, targeting ear level of MLP.
Forego any thought of .6 for heights exclusively(tops), as you will have the same effect of only having a . 2 system, as the audio engineers use that more so than any .6 mixes.
I’d recommend reading some of the Dolby Atmos threads and the mixes most movies are coming out with that the audio engineering are doing before adding a bunch of speakers and cost to your system. You may find that you have a much better system audio wise than most movies take advantage of as the audio engineering was not done to take full advantage of systems some of us are running. This only leads to you being disappointed in audio quality in the end after having spent a significant amount of time a money into your system only to learn later that you might have been better off with less.