I wired the two speakers in series aiding, figuring their 12 Ohm sum (The P363 reportedly tests to ~6 Ohms.) would be better than a 3 Ohm parallel match to my Onkyo receiver. I used a no-name digital sound level meter from Amazon, a handy bargain, to equalize the white noise level at my seat. The two CC P363 towers probably do offer constructive/destructive interference defects - but to my ear, it sound fuller than my 20-odd year old Klipsch KV-2 did and not as lop-sided as just one P363. Besides, my wife's insistence that I 'balance' the look - ie, remove the left side of monitor sub and put another doodad stand (P363 tower) in it's place - wasn't really a suggestion. The sub-woofer wasn't needed, as a total of twelve 6.5" LF drivers are at hand for the low end. Additionally, I've never had such a clear cc dialogue presentation. No need to try to 'rattle the floor' as this is a garden home with the carpet & pad atop a concrete slab anyway!
My suggestion to the OP to buy Klipsch towers was in keeping with the common 'voice' his current other Klipsch speakers present. While I paid $99-$107 a piece for the P363's - eight total as my wife has a pair in her music room - I have a pair of Klipsch RB-81ii's in my office stereo and a pair of R-15M (BF $124/pr from Amazon!) in my bonus/hobby room - I like their horn sound - but I am 67 with a dip in my aural response from 3-4 kHz (Yep -female speech - I have a verifiable reason for not hearing my wife!) and a roll-off over 10kHz.