LCR speaker setup

I'm setting up a theater room in the basement. Using Sharp Elite 70fxd led, and front in wall klipsch LCR speakers. My front LR are klipsch kl7800-thx. I am putting them 2ft. above the floor. So base of my speakers will be at 2ft. They are 8ft. apart. 4ft. from the center. I'm watching it from 12-13ft. away. I'm very confuse about where to place my center channel speaker, above or below. If I put it below than it will be 2ft. above the floor, which I'm afraid will be to low. If I put it above my Sharp Elite LED, it will be 6ft. above the floor, which I think is too high. Can someone please help. Thanks.

SO HERE IS MY COMPLETE SETUP I AM PLANNING TO ACHIEVE: I'VE ORDER ALL MY SPEAKERS FROM KLIPSCH AND GOING WITH IN WALL/CEILING SETUP.

SHARP ELITE 70X5FD (70" LED T.V.)

PIONEER ELITE AV RECEIVER: SC68

LCR IN WALL SPEAKERS: LR(KL-7800_THX), CENTER SPEAKER (KL-6504-THX)

SIDE SURROUND ARE IN CEILING: (KS7502), THEY ARE SPACED 5FT. APART FROM THE CENTER (TOTAL DISTANCE 10FT FROM SPEAKER TO SPEAKER.

SURROUND BACK ARE KS525, THEY WILL HANG ON THE WALL ABOUT 4FT BEHIND MY COUCH.

DISTANCE FROM TV TO SWEET SPOT IS ABOUT 13FT.