The present invention relates to a concealable apparatus assembly, comprising a support structure (5) supporting an apparatus (M) and rotatably receivable in an opening (1a) of a board or of a plate (1) so that the apparatus (M) is accessible through said opening (1a) from a first major surface of the board or plate (1) at a first angular position adopted by said support structure (5), and concealed for other angular positions adopted thereby, the support structure (5) having or supporting a flat surface (2) which remains flush with said first major surface of the board or plate (1) at a second angular position adopted by said support structure (5). The support structure (5) is also linearly receivable in said opening (1a) so that it can move linearly according to an approaching/distancing direction with respect to the board or plate (1).