I have 230/480 panelboards against a wall that I would like to protect from rolling material carts (accidental contact) I could install a 6" piece of angle iron on the floor that is not in the dedicated working space and does not interfere with door openings or panel fronts but it is only 6" away from the plane of the front panel. I don't want to install the angle on the floor at 36" if lit is ok to install at the foot of the panel for protection of the panel. Any interpretations?