A fixing plate for concealed devices used for wall-mounting an item of wall furniture comprises on at least one side a box section having pairs of holes for fixing screws which are aligned on an axis which intersects at least one wall of the furniture item in a non- perpendicular manner. Preferably, said plate comprises respective triangular box sections on its opposing vertical sides and on its upper horizontal side, said holes being provided at the base and vertex of the triangle respectively.
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