you can have all even stats with 27 point buy.
14,14,14,10,10,10 is 28pts
if you count on background +2/-1 or +1/+1/+1
you can have:
14+2, 13+1,14, 12,10,10
15+1,15+1,15+1,8,8,8
13+1,13+1,13+1,12,12,12
or one odd score intentional for 4th level bump to 18
15+2,14,13+1, 10,10,10
you need 3...