See this is what I mean. Scrapping requirements. That's dumb. Don't call it Atmos then.
Also, Logic Pro is a decent way to start (you could already do this with their plug-in, but now it's coming with native support). To mix in Atmos though you're going to need a lot more things like a renderer (and obviously all the other things that come with proper Atmos mixing like a 7.1.4 setup which isn't going to be cheap if you're looking to do this using proper speakers).
A proper 7.1.4 setup doesn't strike me as something indies would have access to tbh.
So this new fangled stereo recording technology only licensed practitioners should be allowed to use it in licensed rooms?
Either Dolby opened this up or it would never see adoption and if a sound field based system was wanted by the market (which the jury is still out on) then a competing and open system would win out. Personally I would prefer that but Dolby have managed to get distribution to sign up to Atmos.
Currently the cost of entry for 7.1.4 monitoring system is less than 10k so accessible to independents. This is not going to hit film reference levels or be properly calibrated but for producing music this segment of the market does not care.