The Tripoles will work perfectly for both applications. No compromise with either.If I use the M&K tripole speaker as SL and SR near or against the back wall I'm sure it will superb for movies.
Who can tell me if the use of such speaker (or dipole from different brand) also delivers good sound if being used for multi-ch audio?
The alternative is obviously using "normal" direct radiating speakers as SL and SR. I assume that will be better for multi-ch audio, but a lesser experience for movies ...