Mirror (on) Mirror, on the Wall

Earlier this week, I mentioned the mirror-on-mirror idea as a possibility for my $100 bathroom update. I thought I would share some inspiration images where this has been done right!:
Tricia Huntley
via Better Homes and Gardens
Kelley Proxmire via
via Carter & Co.
Veranda magazine via La Dolce Vita
What do you guys think of this look?
I read a tip from designer Tricia Huntley (who designed the first image) on Apartment Therapy to use a small i-hook and fishing wire to achieve this look in a rental. I am worried that it won't be strong enough though...my mirror is pretty heavy!
Happy Weekend! xo