The important thing is to make a block and not a row.
I have grown them in fours, fives and sixes before without any problems in a few different different areas around the plot. Even grown a four in a raised bed before.
Last decade or so have a section of the plot where I have 12 together in a rectangle 4x3 rows.
My Dad grows his in a block of five, four on each corner and one in the middle, with great success.