I can answer the question about the belgian national team we play in a 4-1-2-3 against a normal opponent (like scotland) and in a 4-2-1-3 against a strong opponent (like Croatia)
example 1
-----------------------------Courtois--------------------------------
-----Alderweireld---Kompany---Vermaelen---Vertonghen-------
----------------------- Fellaini--------------------------------------
---------------Dembéle----------Witsel----------------------------
De Bruyne----------Benteke -------Hazard-------------------
example 2
-----------------------------Courtois--------------------------------
-----Alderweireld---Kompany---Vermaelen---Vertonghen-------
----------------------- Fellaini----Dembéle-----------------------------
-------------------------------Witsel----------------------------
De Bruyne----------Benteke -------Hazard-------------------
At the moment is Benteke our first choice Striker then follows Lukaku,Mirallas,vossen,de ceulaar/mboyo
bench: Mignolet,Lombaerts,Defour,Lukaku,Mirallas,Mertens,Chadli,Van buyten,gillet