A mounting assembly for an optical touch system can comprise an elongated member defining a top face extending in a plane. A first mounting portion extends perpendicular to a first end of the elongated member and a second mounting portion extends perpendicular a second end. The elongated member defines a first side face perpendicular to a top face and each mounting portion defines a second side face perpendicular to the top face. The mounting assembly is directly mounted to a panel with the top face of the elongated member overlaying at least a portion of the front face of the panel, the first side face overlaying at least a portion of the top edge, the top face of each mounting portion overlaying at least a portion of the front face along the side edges, and each second side face overlaying at least a portion of a respective side edge.