Frankly, the space is not enough, there are already lots of cables behind the rack, and most of them are thick and hard, so the speaker cable needs to be looped.
For the position of the speakers, cant pulled out anymore, or they will occupy the living room space. Now the distance between the wall and the speakers is 8 inches, sound result is acceptable, bass is OK, no booming. Sometimes, need to balance between the sound quality and the space and look of the listening area, no method.
Remember the equipment advice you gave me? You recommended Condor MCB, Pirelli electricity wire, Hubbell and MK sockets....They all work well and match my Naim, Dynaudio and Onkyo. Thanks again.