I don't know how good a system you want in that space.
I know of no good commercial speakers designed for corner mounting.
It is possible to make an excellent speaker for corner mounting. You have to make the corner mounting part of the total design, especially the bass loading.
This has not be done to my knowledge since Gilbert Briggs designs for Wharfedale back in the fifties.
I did do a corner design for my previous home and enjoyed these speakers for about 30 years..
If you want an excellent result this means DIY.
I know of no current commercial designs that would perform like the speakers illustrated.