it depends on what formation u use.
if i go with a 4-2-4 (or 4-4-2), i only have 1 CM that does the tackles and the other that creates. i use players like Yann, song, or like rodwell in that underlined position once for a long term first choice .
if ur using a 4-2-3-1, the i'll have 2 cms that create chances (like cesc, wilshere, or my creative player like pasotre, ganso) and 1 cm that tackle same like i said before.
but why do u have like 4 DM ?. and do u use them every match. oO)