Dipole rear speakers ???

Also, you could easily mount your dipoles upside-down,firing toward the floor and ceiling along sides and on the back wall, if need be. Still a better option likely than dirrect firing on the back wall in your sitch, without any other considerations

I have 7/8 year old Martin Logan Quests as sides and as rears. Since the rearward sound of these is as loud as forward,I put carpet tiles around the corner walls that are close by. The result is great (no "bounce, echo, reverb),and they work well with the M-L Prodigy's at L&R . The Quests are no longer expensive.
Hope this helps. Don

I've only used them as side speakers, and they do the job.