Glad you watched the video!
I think you can attach the cleat anywhere near but above the midline. The placement will often be influenced by where the piece is most opaque and can conceal the hardware.
30 years ago, when I worked as a picture framer, we customarily placed the fairly tight crosswire one third of the way down from the top, which caused the bottom corners to touch the wall. We applied felt spacers/bumpers on the bottom corners to keep the four corners closer to equidistant from the wall.
In the case of the cleats, if you place it closer to the midline, I would guess that the corners of the piece are likely to be better balanced, resulting in all four corners being equidistant from the wall. But above the midline should work fine, too.
Mary Kay Nitchie
Bullseye Glass Co.
Subscribe to Bullseye kiln-glass videos at