Hey jaytoon... if I understand you right then you want to mount this mirror on top of the two different borders (does not look like the middle mirror will fit between borders)
Here is what I would do... I would determine the depth that the top border tile sticks out. Then I would cut two blocks of wood (8 inches wide) equal to that depth plus 1/8" and glue them onto the mirror just below where tile on top and just above where tile on bottom will end up in relation to final mirror placement using a caulking made for mirrors (call local glass shop and see if they can recommend a brand that does not bleed through mirrors.. if not, see if they will sell you a tube
). This will keep the mirror off the tile and keep mirror plumb to wall (you said lower tile stuck out less than top border tile... yes?).
Then you will need to get a masonary drill bit to drill through the tile and then set some plastic anchors in tile. Now install the mirror brackets Speedball1 suggested and hang that mirror onto brackets (I assume a wire crossing the back of mirror will catch the brackets). MIRROR clips will not work here.
Then, because I see there are shelves on that middle mirror.. I would place some liquid nails caulking onto the wood pieces attached to mirror and place my mirror.
Plumb it/level it side to side... cause will not move when done. Just make sure no slack in wire on bracket.
If no wire on back then you could use an epoxy approved for use on glass/mirrors and epoxy a clip on each corner (SEE PIC. BELOW) and string wire across to each after epoxy dries. Then follow instructions as presented (wire must be twisted around bracket and then twisted back on itself a good ten/twelve times on each side)
That is how I would do it... good luck... let me know if I missed something.
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