It would be better to have a join where your laser line is. That will get rid of the two thin slivers of tile near the top and bottom walls in your photo.
In the other direction put the centre of a tile in the centre of the gap between the two walls. You will the end up with one full tile along the length of the room and large cut tiles in the doorway and near the opposite wall (I assume that your room is slightly less than 3 tiles wide)
In the other direction put the centre of a tile in the centre of the gap between the two walls. You will the end up with one full tile along the length of the room and large cut tiles in the doorway and near the opposite wall (I assume that your room is slightly less than 3 tiles wide)






