If you have the right room, then I would use the THX format for mounting speakers. Less optimal rooms require massaging where you can mount your surrounds.
Have heard the Atmos in a theater, it did sound great but you need a big room for that many speakers. When they are that close in an average home it seems to me that it is an unnecessary expense.
Besides, how many 7.1 discs are there? Much less 9.1, 11.1, 13.1 discrete channels anyway. A good 5.1 or 7.1 has sound that is satisfactory for the majority of homes. To me this is a fringe expense for large theaters and would not benefit the average home owner.
The only concerts I have been to that had rear speakers was Emerson, Lake and Palmer or Pink Floyd. And that was back in the 70's. Most music comes from the front of the stage, with the echo ( if it is a really bad venue ) causing a bad slap effect or the sound was so dead it sounded like an anechoic room ( music practice room ).
Just my 2 cents.
Klipsch so much it Hz
OTA all the way