If you plan for your mirror to take up permanent residence on your vanity, one that needs to be connected to an outlet might not bother you. But if you intend to move your mirror around or travel ...
Alternatively, using two separate mirrors above a double vanity adds symmetry and a sense ... unless you want it to act as a backsplash and touch the countertop. This distance will help you ...
Do you have a grand antique mirror that hung above your vanity unit for decades? Adding a few more inches to your counter ...