it doesn't depend on qty it depends on your players level and the tactics ,, you should have both dc with highest degree ( if you are in level 3 i think it should be ( 34 ) with higher diffinsive stats ,, mean when you buy definse player you should select players with high definse stats much more than attack stats and more than physical and mental stats
try 4-1-2( mc-mc ) -1 ( amc ) -2
or
4 - 3 ( ml - mc - mr ) - 1 ( amc ) -2
good luck