Will burying a mirror under someone else's wall affect Feng Shui?

It doesn't matter, even if it's not buried under the wall, it won't have much impact on people.

Buried in the ground is useless.

Can't produce reflection, what effect can it have on Feng Shui.

Mirrors only have a great influence on people under certain circumstances, and so do you.

It can be understood as having an influence on feng shui.