Product review (3 stars): Pleased
If you can stomach getting four padded stickers and two small brackets for $20, you should be fine.  Stickers go over the bottom of the dryer where the ridges protrude the most (to prevent them from damaging the washer below.  Brackets snap into the dryer and then screw into the washer...it takes some elbow grease to screw them in but when you line things up properly and fight past the middle of the screw, it works.  I've regained a bunch of space and am generally pleased.