In one aspect, a holder assembly includes a substrate-mountable holder having a metal base having a centerline, the base having a plurality of openings to receive a plurality of fasteners, a generally symmetrical wireform having a pair of legs with a portion therebetween, the portion welded to the base, each leg having a first segment extending parallel to the base and a second segment extending outwardly of the base. First segment of each leg may be generally parallel to the centerline, or first segment may be angled with respect to the centerline. Second segment of legs may extend generally linearly outwardly of the base or may have radii of curvature.