In my studios we always used something attached to the ceiling rather than a boom, I hate cluttered floors if possible. A track would be perfect, but since we usually had three poles hanging from pulleys for backgrounds, we'd use one of those for the hairlight and could place it whereever we wanted, and drape the cable off to one side. Sorry I don't have a pictire. It really depends on the height of your ceiling, the higher the better. If its low, you could also rig a way to bounce the light so it makes a soft hairlight. Me, I rarely use it anymore anyway, I think its kind of a dated look, unless you're going after a full-blown glitzy back light kind of thing. Check out these two shots of Cindy Margolis, the yellow background was a couple years ago, the green from 10 years ago.
Andy Pearlman Studio