how to lay porcelain tiles. 

It's the perfect way

What if you put the tile down and one side is too low?

The arrows have nothing to do with the direction they lay. If you want to point all the arrows in the same direction you can, but it doesn't matter.

Sorry but wrong mix and not the correct way to install , need full coverage and need to set a correct height

You guys are lost have no tile experience whatsoever