IMO it is a bigger issue than you think. I do believe that when it comes to using solar power for your sound system micro inverters have no noise.. Wall batteries are a must for anything solar. There are systems IMO as good or better than Tesla. I am all Sun Power which is 100% made in USA and have the longest warranty (25 years) as well as the best efficiency of any other manufacturer. SunPower has an efficiency of 120% of what the panel is ratedIn my experience, micro-inverter vs. master inverter is not much of an issue, in part because the master inverter is usually many feet or yards away mounted on a side wall of your house. For example, I have a master-inverter. I have two hifis. The primary hifi directly under the solar panels is the one susceptible to the waterfall of RF noise emitted by the panels when running certain SET amps. The system that is NOT directly under the solar glass but IS CLOSER to the house-mounted wall inverter is unaffected by the power system's RFI.
Don't worry about a sidewall, house-mounted inverter. Worry about RF emitted from panels overhead. They do, in fact, emit. Especially don't worry about what you cannot get. You can get amps that will reject the RFI shower, but that may require a little trial and error.
As for transformerless inverters from the battery feed, similarly don't obsess about it. It's not like a Tesla Powerwall installation makes your system battery powered. You are still going through an inverter one way or another. to send AC to your house. In the nighttime when all is quiet and I am still powered off the Powerwalls, I can convince myself it sounds a little better, but not conclusively better than low-demand nighttime LADWP grid power. You are not going to get perfection just because you install solar and batteries. You can make sure it doesn't get worse and might be improved when you are really listening for it.