Look at the higher quality in wall and in ceiling speakers. With your requirements I would forego worrying about imaging and just concentrate on clean, clear, dynamic sound that let's you enjoy your music in more of a club like atmosphere where you hear the music regardless of where you are physically.
You could also have a set of monitors on stands that you set up occasionally when you want to listen in a 2 channel stereo setting. I have a friend with a very large/expensive home that presents like a beautiful model, but no unsitely wires anywhere to be seen. All lighting is from above or built in wall sconces. He brings in his speakers (Tidal "Piano"), which are in a hidden wall cavity and hooks them up to a killer hidden system. He may leave them there all weekend or if he plans to listen during the week.
You could also have a set of monitors on stands that you set up occasionally when you want to listen in a 2 channel stereo setting. I have a friend with a very large/expensive home that presents like a beautiful model, but no unsitely wires anywhere to be seen. All lighting is from above or built in wall sconces. He brings in his speakers (Tidal "Piano"), which are in a hidden wall cavity and hooks them up to a killer hidden system. He may leave them there all weekend or if he plans to listen during the week.