I really like the way this planter looks.  I added it to my wrought iron railing.  It was unclear how the brackets were supposed to attach to a railing like mine, so I just bent them after I added it to the railing.  There's no way for it to fall off the railing now, but it just rests on it and can be moved from side to side if necessary.  The weight of the plants and soil keep it in place just fine and I've had many compliments.