I added a DSW to my 5200SE’s last May.
It’s in the corner just behind the left speaker. I didn’t have time to try other places yet but I’ll probably leave it there.
Set to the music, option 1 and gain on -3. and it sounds really really good. It added lots of space to the sound.

Mac -> 818v3 -> 5200SE / Mac -> Director -> 551 -> Epos K2