DBX1000M Dryer Vent Box with Trim Ring for 2x6 framing

Is the Hole location in the right or left for a downward vent?

can this be mounted outside the wall on the sheet rock?

Is it for new construction only, or can it be cut into the finished drywall? Also, instructions/ installation manual?

Is there a version that has the vent hold on upper right instead of upper left?