Are you sure its 130 pounds? 1/4” glass weighs 3.25lb/sq ft. Your mirror is most likey 3/16” thick at best, so 3.25 pounds X .75 = 2.4375lb/sq ft which means you have a 53 sq ft mirror?

In any case, with a mirror that size, I would make sure it has safety backing on it. Bascially its a glorified sheet of sticky stuff on the back that keeps it in 1 piece if it were to fall, or something hit it.