@PhilNUFC
Not sure anything is realistic in FM, let alone tactics.
Anyway, the top tactic and many 451s are realistic in FM Terms ie no IWBs and IF W set up.
I would also say KLOPP Tactic is realistic as they are very attacking and use full press in reality.
WARRIOR 62% may qualify as a PEP Tactic.
Probably the 4231s 442s 352s would probably also qualify as realistic..