What speakers work well against a wall

Might want to check out Von Schweikert Vortex speakers. Actually made to be just inches from the wall. Three models from around 2500 to 6500

If you are thinking of smaller speakers, you should check out a couple of Swedish offerings:  Guru G-10, and Sjofn's "the clue".  Both are designed to sit literally 1" from the back wall, being designed for the boundary reinforcement.

I run "the clue" in my living room system, because this suits my significant other much better.  They sit in bookshelves on each side of the fireplace, and to be honest, they sound pretty good and articulate.  Bass is adequate.

I had the Wilson Audio Duette 2's and they do work super well right against the wall.  I currently have Sonus Faber Amati Tradition Homage speakers and they are right against the wall.  I love the sound.

Wide speakers with a large baffle will work best. To get really close to a back wall check out these...



https://systems.audiogon.com/systems/6257#&gid=1&pid=3

Horns work well too. The importance is to minimize the frequencies going backwards (sound that wraps around the baffle). Horns do this by virtue of directivity and large baffles prevent mid range sound wrapping round the edges of the speaker cabinet.