I had originally planned to mount to the wall behind my tank, on a custom hinge. However it is horse hair and makes me nervous. So I bolted black unistrut to the back of my stand and used that. I dont love the look of it. And with the weight of my lights it sags a little. However I am planning on mounting a floating canopy to it. Which will hide most of it, and definitely reduce light spill.
I am in the process of wrapping my stand as we speak. Then on to the canopy. When I do I will anchor some aircraft cable to the ceiling to get rid of the sag and level off the lighting. Originally had T5s, then switched to LEDs.