DBTech DB-Tech Large Suction Cup Magnifying Mirror with Precision Tweezer (5X, 10 Inch)

I can't get the suction cups to stick to my cabinet door. Any suggestions?

Is this mirror fog free for use in shower?

I cut my own hair. I am looking for one to put on the wall across from bathroom mirror to see the back of my hair, Is it clear at a small distance?

How close do you have to be to be apply eyeliner?