They were sold with the window box and made to look like it was a nice fit.  I would need to put a 2x4 behind it to have it fit as pictured.  Disappointed.  The planters were packed together but different.  One has 4 corner holes with rubber stoppers/feet the second has 4 corner holes and 3 center larger holes for draining, no rubber stoppers/feet.  What the heck, am I suppose to drill drain holes myself???  Over deck rail will work but not with the box bracket or window box planter.  I have not used the shutter dogs yet, waiting on my shutters to be delivered.  Thank you!