Will new Sonos ARC provide full featured Dolby Atmos quality sound when connected to: 1) ARC-enabled Samsung TV (Q9; late 2018 edition); and 2) latest Atmos-enabled 4K Apple TV?

We really enjoy our current Sonos home theater set up (Playbar, Sub, two 1’s) connected to a 75” Samsung Q9 TV (which has ARC but not eARC capability). I have pre-ordered the new Sonos ARC sound bar to replace the Playbar of course.

That said, I am getting different answers and information from the Sonos community site and also when chatting and then escalating to speak with the Sonos techs. Still no clarity and consistent information.

So can anyone give me a definitive answer as to what I can expect by way of full or limited or no Dolby Atmos sound if I go through with it and install the new ARC with my:

1. Samsung Q9 (late 2018) TV with ARC but not eARC 
2. Apple 4K TV?
3. Are there any work arounds if the answer is limited / no to get full Dolby Atmos with my set up?

Thank you in advance.