of the beam, side of the bean or bottom of the beam?
side of beam toward the fireplace, so it does not obstruct the view of the beam. I'll also use task over the bar attached to the bottom of the beam, luckily for the electrician the beams will be wrapped to "beef" them up.
of the beam. If possible I try to keep the track fixture hidden from view.
If you have an area that needs task lighting, like the kitchen island, then hanging the track from the ceiling or on the bottom of the beam works best.