Which TOWERs work well CLOSE to the BACK WALL?

I have a budget of $10k to $25k and am looking for speakers that perform well when they are placed close (say 6 inches away) from the back wall.

Also, thoughts on which speakers to avoid.

I am looking at REVEL and B&W, but am willing to consider others (maybe Thiel, McIntosh, Martin Logan, ?).

Someone noted that I should avoid any rear facing ports. True?

Other considerations are that the fairly large hexagonal room has lots of glass.

In terms of music, we enjoy all sorts of rock, blues, and guitar of all types. Finally voice clarity, cymbals and high treble are important.

Thanks