if you want to build a PoB anywhere remotely close to Rheinland, this is your fate.
You will have to deal with factions with battleships, such as Corsairs, Red Hessians, Coalition, Unioners and federal/imperial forces. Its just how it is.
I would advice you, to never build a PoB anywhere near Rheinland or its border systems unless you have an armada of friends at your disposal, 24/7 to defend the installation