I had purchased a flat wall mounted unit with the glass pellets.  I ended up with a unit where the glass frame is 3" from the wall!  Unless you can put it on an end wall, where you can't see behind the frame vs a side wall where you can see the box behind the frame.  Now I must get creative with black glazed tiles or use crown moulding.  The top and two end pieces must be able to open to let the heat out and use the controls on the ends.
fg