Mounting 7.2 surround speakers up high on the walls

Hi, my dad gave me his Klipsch THX Ultra2 home theater system, his system does not have the KL-525-THX LCRs instead it has 4 of the KS-525-THX surrounds, and I'm thinking about mounding them high on the walls, my apartment has 10 ft ceilings and I don't want them at eye level because of WAF getting her to let me have the front channels was a huge battle that I won, also I can't run the wires thought the walls so i'm going to get white monoprice in-wall cable and run it along the ceiling hoping it will blend in. what do you guys think, will it screw up my rear sound?