Fisrt a ceramic tile needs a subfloor that won`t move you probably don`t
have one, concrete board should be used it is the thinnest strongest
material for tile,

I have to take exception with the part "concrete board..strongest"

Concrete board has minimum strength..You can put it on walls as a tile
backer but as a sub floor, they need something stiff and strong under
tile..like a 5/8 min T&G subfloor..preferably 3/4" and even then, another
layer of something strong like 3/8" ply..glued and screwed. If the floor
flexes, so will the cement board.

R