Do you have a fly system? If so, do you have an open fly at the desired location?
However, this would lead to having a bar in your sightlines. If you would prefer mounting the lights at the bottom, a high ground row may be your best bet. You can build it at whatever angle you want, just slope the top piece, or whereever you want to mount the lights.
Edit: In order to prevent the lights from being visible, a ground row is pretty much obligatory.
Your going to need to either rig it from a batten or from the ground. A few booms would be able to do it without much issue. Whats above your stage? What kind of rigging equipment do you own/are familiar with?
I'm not sure exactly how the clamps and everything are setup on the strips, but sight-unseen I would suggest just using a pipe and base on the high end, or perhaps angle steel, though I'm not sure exactly how well that would support a heavy light that is off-axis.