The use of M3 as center matches quite well with my mains. Yeah M50s are close alright.
I'm using a single M3 vertical and inverted on top of our 65" Mits, but sometimes it gets rather easy to localize up there. I could snuggle a W3 below the screen inside an indentation of the TVs bodywork where the top edge of the speaker would be on the same plane as the lower edge of the screen and it may work well as long as the M3 and W3 play well together. The W3 would be placed horizontally and hopefully the M3 on top as well.
Orientation of the tweeters would of course be trial and error in a horribly reflective and hideously sucky listening room.
