Is this 4-1-2-1-2 formation valid?

DL-DC-DC-DR
----DMC----
ML(or AML)--------MR(or AMR)
----AMC----
--ST--ST--
I 've always wanted to run a 41212 formation, but don't know if I would be penalized. Instead of having my winger in a normal Left/Right Mid, can I push them forward in the attack position?

I also have some pretty good MCs and I don't want them to go to waste, so can I run these formations?
DL-DC-DC-DR
----DMC----
ML(or AML)--MC--MR(or AMR)
--ST--ST--
or
DL-DC-DC-DR
ML(or AML)--MC--MR(or AMR)
----AMC----
--ST--ST--

In order to have a valid formation, what are the rules of the midfield?

The first one is wide diamond dc x2 dl x1dr x1 dmc x1 ml x1 mrx 1 amc x1 st x2 and is valid. All your formations are valid (not illegal)
If you have an illegal formtion you have only 20 possesion. You need to have a goalkeeper in his natural position min. 3 DCs 1 MC 1ST etc
More info here http://forum.topeleven.com/tutorials...formation.html