Product review (4 stars): Dryers are deeper, but walls aren't
This vent periscope is well designed and does what it should to allow you to get your dryer closer to the wall. I wish the material was thicker so it wouldn't bend so easily if you get resistance pushing the dryer back to the wall.

One helpful hint for installation, take a large piece of cardboard and create a template of where the exit vent is on the wall relative to the floor, where the edge of the dryer will be, and another known point (in my case, a wall). Cut the vent hole out of the cardboard and then you can position the periscope correctly and cut off excess metal and foil tape the moving edges of the periscope in place to seal it.