Disclosed herein is an adjustable mounting assembly for mounting an electrical module relative to a supporting surface. The assembly comprises: mounting means adapted for embedded anchorage relative to the supporting surface; a holder having an aperture for receiving and holding the electrical module, the holder being adapted for moveable engagement with the mounting means to facilitate adjustment of a position of the electrical module relative to the supporting surface; and fastening means for fastening the holder to the mounting means, the fastening means being accessible for unfastening and refastening via the aperture to facilitate re-adjustment of the position of the electrical module relative to the supporting surface.