Support spacing is a code requirement as well as a workmanship issue, and the hardware has to suit the substrate: strut and channel for overhead runs, brackets for stud walls, concrete inserts for slab. Box positioning matters when boxes must land at a consistent height or depth across a wall, which is where adjustable brackets and box supports earn their place.
We stock strut clamps, conduit hangers, box supports and brackets, spacers and the fasteners that go with them, in trade sizes matching the raceway they carry.