So, where are the intakes (and exausts) for the forward three?
There are many intakes as part of the propulsion superstructure, some of them are allocated to the forward three generators (and the others of course to the main prime movers).
Point is that it's likely not a clean and simple "one intake per generator" arrangement.
The exhausts are for the three forward generators I personally have yet to be able to identify, it's possible they are fed and integrated with the exhausts from the main prime movers.
The exhaust for the three rear generators are of course very obvious on any photo of the ship taken from a high angle, located atop the rear helicopter hangar structure with three small circular exhausts just rear of the circular radome.
That said, looking back at it, I think it is possible that perhaps some of the intakes may be for the rear three generators, because there simply aren't that many obvious intakes at the rear of the ship at the helicopter hangar, and the shortest distance to those rear three generators may be via some of the rearmost intakes on the superstructure (though it still seems a bit volume inefficient).
Either way though, it's still not one intake per generator.