My kitchen units on the right hand side hang 1/2 inch lower than the left side. I will have 5 rows of 200x100 tiles to make a brick effect. I was told to divide the half inch by the number of rows of tiles which will be 0.1 inch on each row? I am wanting to know how this will effect me using the 4mm spacers as they won’t be doing the job they should so do I just put them on the sides and leave off the bottom and top? Many thanks.