Mount a flat bathroom mirror without a gap from the wall

Hello everyone,
we would like to install a bathroom mirror as close as possible to a plastered wall.
Do you have any experience on how to do this best?

Regards

The simplest mirror holders are already tightly fitting. Isn't that enough?

Otherwise, there are mirrored cabinets for installation. That is also very flush, but there is practically nothing under 2000€.

Or, depending on the size, fully adhesive over the entire surface?