A network interface device which may include: an elongated frame having a first end, a second end, and, between the first and second ends, a top wall, a bottom wall opposing the top wall, a first lateral wall, and a second lateral wall opposing the first lateral wall; wherein the top wall includes: a first longitudinal portion that is adjacent to the first end of the frame; and a second longitudinal portion that is adjacent to the second end of the frame and whose outer surface slopes towards its inner surface in a direction of the second end of the frame.