But having a shield booster as utility mount and on the outside would be ok because it affects the Shields. Kinda like Cellphone Case help protect the Cellphone.
Let take a car. With a Motor (FSD) and Turbo (FSD booster). With a Turbo it required to be near the Motor so it gets either coolant or Oil to keep the turbo cool while using exhaust to power the turbo while forcing fresh air into the Engine. Which give Cars more power. You would not want this mechanic in the Trunk or on the outside, would you? While it would be better in the Engine bay with the motor.
For a small ship that a good build. What I would do is Drop the AFMU and add the FSD Booster if you want longer distance. Avoid doing stupid stuff. Avoid using Neutron superhighway and don't fly under the influence.
Let look at the cellphone case. It on the outside while the cellphone protected by the case. We can also look at bulletproof vests that protect the user from bullets.
Those analogies are god awful, man. Cellphone case could be analogous to added armour, but not shields which are hand wavium barriers. If anything you could argue that the boosters increase the signal in the way an antennae might, but the case for a case being a shield booster is just plain off. Bullet proof vest is also completely unrelated here. There’s Armor in the game already. Shields are something else entirely. Literally it’s another layer on top. That’s not what the boosters are. Anywho, carry on.