I happened to be watching one of those home improvement shows this
morning. They promoted this gizmo:
https://www.homedepot.com/p/High-Mighty-16-in-Cleat-Tool-Free-Picture-Hanger-125-lb-Pack-515310/301675154

In alt.home.repair, on Sat, 28 Mar 2020 06:51:54 -0500, Dean Hoffman
wrote:

I happened to be watching one of those home improvement shows this
morning. They promoted this gizmo:
https://www.homedepot.com/p/High-Mighty-16-in-Cleat-Tool-Free-Picture-Hanger-125-lb-Pack-515310/301675154

I can't figure out what these are or how they work. That's why Amazon
does so well. Best set of pictures of any webpage.

Tbe bedroom set my parents bought me when I was a little boy came with a
large, wood-framed mirror.

When my mother moved, she hired a mirror company to hang the mirror.

She showed them the L or J shaped brackets that had gone under the
mirror in the two previous homes she had and they said they didn't need
it.

A few hours after they left, the mirror fell off the wall.

Broke the glass and the frame. They replaced the mirror but did a
rotten job reassembling the frame.