Lay out your mirrors on a table, mirror side down, so you can glue them together.

Use E6000 for all the creases between the mirrors.

Let that dry, then glue over all of the creases with hot glue.

Add a piece of gaffers tape along each of the lines and in a giant “x” to add strength.

Cut 2 pieces of black poster board to fit the back of the mirrors.

Hot glue the poster board to the back of the mirrors. Hang with command strips.