General Studies · Seating Arrangement / Puzzles

Six boxes M, N, O, P, Q, and R are kept one above the other, but not necessarily in the same order. Only 2 boxes are kept below M. Only one box is kept above Q. O is kept at any of the positions above R but not at the topmost position. R is not kept at the bottommost position. N is kept at any of the positions below Q. Where is box P kept?