Are you using the 534SS speakers as L/R Surround (like for a 5.1 setup) or as L/R "Rear" Surround (as in a 7.1 system)? If you're setting up a 5.1 system the L/R Surround speakers would more typically be mounted on the side walls (above ear level) directly to the left and right of the seating area.
But no matter if you but them to the sides or in the rear, if you're planning to use them in dipole mode I would keep them flush against a wall and well away from any corners.
If you're using them as Rear Surround in a 7.1 setup, it's more common to use them in bipole mode. But in any case try them in different posistions, and in both dipole and bipole mode, to see what sounds best to you.
I'm using a pair of 534SS speakers on the side walls in dipole mode in my current 5.1 setup. These were my first dipole speakers so it's been a bit of a learning experience for me setting them up. It is a pain that you have to make more holes every time you want to play with the posistioning; but I've resigned myself that I may have to sacrifice some wall board to find the best spot.
Best of luck,
Rick Moll
Current 5.1 setup:
Speakers: Aperion (2) 633-T, (1) 634-VAC, (2) 534-SS
Subwoofer: HSU Research VTF-3 MK 2