Generally speaking, most people will put the Kagami Mochi at the entrance where visits the gods and guests, or the living room and the place where putting shrines.
However, according to different prayers, there will be changes in the
place of decoration.
Today's Kagami Mochi is not limited to the real mochi, but the creative substitutes. Even if you do not live in Japan, in order to pray for a good year, what about have a try?