The CSV must go before the pressure tank. An air injector is OK before a standard tank, but will cause air to be in the water chamber of a bladder tank, which is not good. An air injector after the pressure tank will only work when you are using enough flow to make it inject air. Small flow rates won’t let the air injector work properly.
If your iron removal tank will vent the excess air, you could install it before the pressure tank. Pump, CSV, air injector, iron removal tank, pressure tank, house. If your iron removal tank doesn’t vent air, I think you need a standard instead of a bladder tank.