yes i have i played it but it was way back in fm 07 based on the formation germany used in the 90's I had rooney ruud van nistelrooy with totti behind them.
Top five libero's
Phillippe Mexes
Domenico Crisctio
Jan Vertonghen ( always sign him if I try and use a libero)
John Heitinga
Gonzalo Rodríguez
I think once used Tom huddlestone in that role