I want to put in marble tile in my kitchen, without any grout lines. Is there any special way I'm supposed to do this? I read that the problem will be that the edges of the tiles won't be perfectly aligned so there will be bumps, gaps and raised spots unless the whole thing is polished after it is in place (which I won't be doing). If this is not possible to do, what is the thinnest grout line I can have?