3-5-2 is Contes formation. He played 3-4-3 only when he didn't have the pieces for a 3-5-2. Also, considering how everyone in this bastard league plays with a 4-3-3/4-2-3-1, the 3-5-2 is perfect against that formation because it allows everyone to mark man for man in the defence and midfield, while when attacking the 3-5-2 out-numbers the 4-3-3 because of the wing-backs pushing forward (Hakimi did that a lot for Inter this year).
When it comes to players, I've seen a lot of people going for GLC - Ndombele - Hojbjerg in the midfield. That would work under Guardiola, not Conte. Conte wants at the very least 2 engines/warriors in the midfield, so it would be far more likely to see Skippy there or, god forbid, Sissoko. The reason why Inter and Juve worked in the past is because the midfield could withstand and outrun the teams that pressure a lot without the ball to get it back as soon as possible (the 4-3-3 of Guardiola or Sarri for example). Brozovic - Barrella - Sensi or Vidal - Pirlo - Marchisio were nowhere near good enough when it comes to on the ball (guess who aside), but they could run for days.
Another thing Conte is perfect at is identifying misfiring wingers and turning them into effective wing-backs. He did it at Inter with Candreva/Perisic, at Chelsea with Moses and I'd like to think at Juve with Lichtsteiner, but I'm not quite sure if he played under Conte or if he came at the same time Allegri came. This wouldn't be that much of an issue for us down the left-wing, because we have 2 natural LWB in Reguilon and Sess, but, down the RWB, we only have Doherty, so he could turn to Bergwijn, and less likely but still possible, Lucas, to become that RWB that has the freedom of moving forward, since Skippy/Hojbjerg would turn back without the ball, effectively making it a back 4.
When it comes to the attack, as long as Kane stays, we'll have no issue with Conte. He and Son are great for Contes system, but even Dele could play in the Lautaro/Tevez/Sanchez role, alongside Kane, if Conte sees in a match that Son is having his off-days.
The pieces are there for Conte, obviously upgrades are needed, but the spine of the team is great for his tactics. Hopefully Levy gets it done, and properly backs Conte, because the man, while scum in his playing days, knows how to organise a team, and makes it greater than the sum of its parts.