Placement of Dual Powered Subs with Tower Speakers


Just purchased a second REL S/5 Sho. Main speakers rated down to low 30's...I know exact placement was crucial with single sub, wondering if just as crucial with 2...
jl35
Thanks to both...the only placement obstacle that comes to mind is there is a single available electric outlet though I think it’s in a good place. Thoughts on long power cords? Thanks again 
The comments thus far seem to presume forward facing woofers. Currently, I have SVS subs that fire down

See Acoustic Fields website for lots of tips on subwoofer placement