The thing that worries me about downward and rearward facing speakers is they do a great job of not localizing the piano sound, helping it to be diffuse like a real piano.

But… what about all the backing sounds? Those tend to sound better with a directly heard speaker. Be nice if the piano only could be routed to the downward facing speakers, and then the backing routed to the main 1/4” outputs to go to some decent monitors. But I guess there’s always a compromise with a $1000 piece of gear.