If I were to install glass mosaic tile over new bathroom vanity/sink, would I install the tile first and then put the vanity in or put the vanity in and then tile the backsplash?

I am getting a new bathroom vanity/sink and I want to install mosaic glass tile as a backsplash. The backsplash area is relatively small, and I think this is a project I can tackle myself. I saw some videos demonstrating how to install the tile, and it seems like it’s not that hard.

However, the videos I saw showed a backsplash in a kitchen, behind the stove. If I want to do this behind the bathroom vanity, would I do the tiles and then put in the vanity, or put the vanity in and then put the tiles in last?