Installing large format tile large format tiles must be supported properly.
Setting large wall tile.
Obviously large format tiles are heavier than smaller tiles.
So if the tiles are 10 inches high the line should be 10 25 inches off the floor.
Level floors plumb walls.
However a tile may also be considered large format if at least one edge is greater than 15 such as the popular wood look porcelain planks.
The best way is to arrange your wall tile in a pyramid shape.
For proper installation floors and other horizontal surfaces need to be level and vertical.
Mark a horizontal line along the bottom of the wall coming up from the floor by the height of your tile plus one quarter inch.
Install tiles one through four as directed.
If it seems complicated try this.
A tile is considered large format when it is 16 x 16 or larger.
Video tutorial from dunlop on installing large format wall tiles using dunlop adhesives grouts sealants and primers.