A mounting assembly for facilitating the mounting components of a modular system involving a plurality of separate components that are required operationally to interrelate relative to each other when in use so that the relative setting of such components in vertical, horizontal and/or annular orientations with respect to the datum direction is facilitated. A main unit is adapted for mounting to a column support, the main unit being adapted for mounting said components by way of a connection arrangement enabling relative displacement and relative angular setting of the components relative to the base unit.