Quite some years ago, I added a wire shelf to the bottom of the “pantry” closet to hold odds-and-ends. The most recent deep-cleaning cycle required removing the shelf, which required removing the mounting brackets to get the fool thing out of the closet.
The backside of one bracket shows I had a bit of trouble matching the mounting holes to the wall anchors:

The lower bracket bears some advice from my Shop Assistant:

Check thrice
Measure twice
Cut once
From what little we hear these days, she’s learned the value of always checking her work…
And she signs it, too.