I agree with the other post that a better option, if possible, is to mount the surround speakers to the sides. That is what Dolby recommends - 90 degrees (directly to the sides) to 110 degrees (slightly behind) is what they recommend - and they should be mounted high which usually better to avoid furniture, doorways, etc.
You can use that stick on wire channel and paint it to match if you need a really clean job. If the speakers are really high, you can angle them down a little - pointing over the head of the listening position.
2-Ch (HT L/R): Oppo BDP-105 BD, Adcom GFP-750 pre, Bryston 10B Sub Xover, Bryston 4BSST2 / Paradigm Signature S4 v.2 (L/R), (2) SVS SB12-NSD (Subs)
Home Theater: Bryston 4BSST2 amp / Paradigm CC-590 (C), Outlaw 7700 amp / (4) Def Tech UIW-RSSII (LS/RS/LB/RB), Samsung 46” 3D LCD