Yeah I guess bigger is better.
Thats what she said
Also remember that you do a 17x17 one, or any other shape, leave the middel one blank. Since this one would have no dublicate on the other sides.
Also remember that if you put a candel left you HAVE to put a one top, right, bot also. It does always watch X and Z axis.
and if you do not like how it looks, just put a level below or above of the altar a 1 space room and fill it out with candels.