For that, a dipole speaker with the null aimed at the listening position (so as to get essentially no direct response from the speaker) is recommended. That way, you have very diffuse and enveloping surround channels, which is especially good when you have to sit at a closer than optimal distance to the surrounds.

However, there can be an issue with LF power response (if you are running speakers dipole throughout their whole range) so sometimes a mix of dipole sides and rear center (if used) can be augmented by monopole rears in the back corners. This particular suggestion came out of Earl Geddes "Premium Home Theater" book.

Also, the increased power handling of a line array simply isn't needed for the side and rear channels and you can go with something more modest, output wise.