The mod that you need:

Overload
- SimplePlanes
- Steam

Camera Vantage:

• Is Active: Turrets
• Look Pitch: TPitch
• Look Yaw: TYaw

Main Activation: Turrets

Gunners View

• activationGroup: Turrets
• input: clamp(TYaw/90, -100, 100)

Rotator for Camera

• activationGroup: Turrets
• input: clamp(TYaw/90, -100, 100)

Upper Turrets (360°)

Yaw Rotation:
- activationGroup: Turrets & (TPitch >= -90 & TPitch <= 0)
- input: clamp(TYaw/90, -100, 100)

Pitch Rotation:
- activationGroup: Turrets & (TPitch >= -90 & TPitch <= 0)
- input: clamp(TPitch/90, -80, 0)

Guns lock at dead zone: Turrets & (TPitch >= -90 & TPitch <= 0)

Ventral turrets (360°)

Yaw Rotation:
- activationGroup: Turrets & (TPitch >= -0 & TPitch <= 90)
- input: clamp(TYaw/90, -100, 100)

Pitch Rotation:
- activationGroup: Turrets & (TPitch >= -0 & TPitch <= 90)
- input: clamp(TPitch/90, -0, 80)

Guns lock at dead zone: Turrets & (TPitch >= -0 & TPitch <= 90)

Tail Turret (85°)

Yaw Rotation:
- activationGroup: Turrets & (TYaw >= -85 & TYaw <= 85)
- input: clamp(TYaw/90, -100, 100)

Pitch Rotation:
- activationGroup: Turrets & (TPitch >= -50 & TPitch <= 50) & (TYaw >= -85 & TYaw <= 85)
- input: clamp(TPitch/90, -60, 60)

Guns lock at dead zone: Turrets & (TPitch >= -60 & TPitch <= 60) & (TYaw >= -85 & TYaw <= 85)

I set all of this as "Default". Once you get enough experience with it, you can do some edits and modifications to adapt it to your own aircraft.