Lad around here people define "good" in different ways so I'd say that depends on your definition.
I'd say this much: I haven't seen a 4-2-3-1 working even CLOSE to how I seen some 4-2-3-1's work on fm 19 for instance , I was promoted with dundee united then won the scottish league first season almost 20 pts clear. You'd be lucky to finish mid table I think your first season and if you define that as good I can suggest a tactic or two.
I mainly play a 4-2-3-1 and it works alright. It's a pretty generic gegenpressing tactic with a few tweaks (mainly just ticking the "play offside trap" TI and adjusting a few other settings like width and making the roles and duties fit my players without unbalancing it). I tend to just start with the basic tactic and try to tweak as I go along rather than designing one from whole cloth. It seems to work better.
I have seen people say on other forums that gegenpressing might be slightly broken in '20 though, so I may be just exploiting that rather than doing anything ingenious. I also have relatively good (i.e. top half) talent relative to the other teams in my league, so take it with that pinch of salt.
I had 23 clean sheets from 35 Edersons games played with mancity 4231 so i think if you can somehow make the striker score a goal i think 4231 will be a beast. In older fms i didnt had this scoring problem. Also as i said i can beat big teams consistently but i suck vs 20th and 19th more often than not. I dont know why when they are in complete dissaray how can they beat steamrolling city....