This tactic is most likely to work for higher reputation teams with a strong attack also provides a strong defence despite the lack of midfielders. I let my assistant to do all training and OI, so just put it into practice and sit back to see the results. It can also work by changing one of the strikers to an AF if thats the way you prefer to play and a strong back 4 will keep the defence nice and tight. See the pictures to see that Bertoletti scored 46 goals in all comps using this tactic and Ivan Lopez(another top regen for me) to keep 35 clean sheets throughout the season in all competitions.
Give it a go and let me know your results!!!