Number of Mirrors on a wall
Try to use a single piece (ONE) or (THREE) piece mirror as shown in the attachment. Avoid placing exactly two pieces of mirror at the dining table area.
Often for convenience, the contractor will arrange for a two piece mirror to be installed. Most likely, if the wall is too large, it may either not be possible to bring up a single piece through the lift or even from the staircase. Alternatively, it only takes a few minutes to bring up a two piece mirror via the lift.
However, two pieces of mirrors is considered inauspicious as the line "cuts" exactly the middle of the dining table. Thus symbolic of a "split" or food when placed on the table is cut into-half.