Do you have access to the room via an attic or crawl space? I would just get CL2 or CL3 speaker wire, fish the wire up/down, and use wall plates at the surround speaker locations. I have an 11 speaker setup and the only speakers with visible wires are the Left, Center, and Right because of wire thickness and distance from those speakers to my gear.
You'll mess the entire sound-field up if you calibrate Audyssey with speakers in temporary positions and then move them around without re-running Audyssey.
Denon AVR X7200WA, Emotiva XPR-5, Emotiva XPA-7, Sony XBR 75" 850C, Oppo BDP-103D, Roku 4.
DefTech BP7000SC (L/R), CLR3000 (C), SM55 (FH), UIW BPZ/A (SB), UIW 75 (TM).
JBL L7 (Sur), EoSone RSR 350 (RH).
PC 2.1 setup. Emotiva Stealth 6, SVS SB2000 sub, Emotiva DC-1 DAC.