There's a cable velcro tie method, but the one I like better is just drilling a hole through one of the plastic clips and then just putting something in there that wont fall through - plastic cable tie or one of those pins with a ring on them...

And I found a video:

Click here to watch video.

I opted for a re-usable cable tie option for the left most hole, normal clips for the other two so the cable tie stays hidden and still easy to access. :) Supposedly HD made some new mount clips which fixes this problem, forgot the part number :\

Thanks lads, went the Velcro option. Seems to be doing the trick for the time being.