I feel that such critical facilities should be more inwards away from shore. An internal geo location itself acts as a deterence & forces the only solution to use BMs or low altitude deep strike by jets. Otherwise in war time they can be more easily targeted by cruise missiles launched by enemy subs, etc. Supersonic cruise missiles already exist & hypersonic ones are being developed. So basically a BMD level system will have to be deployed to protect key facilities against CMs & BMs.
Western Ghats (Nilgiris) is there to cover coimbatore from western side.