[jnaas2]

Lay the tile so one of the grout joints break on the crack and caulk it with a good silicone caulk. Go to a tile store they have a lot of different colored silicone caulks that match there grout colors or pick a grout color to match the silicone caulk. Then if the crack widens or shrinks the silicone will expand and contract instead of breaking any tile