The fact that Germany still allows the presence and construction of extremely expensive and big NSA surveillance centers (tapping into German infrastructure) such as the "Dagger complex" [0] certainly says a lot with regards to "sovereignty".
"extremely expensive and big"? You're joking, right? Look at the pictures... or are you claiming there's some gigantic underground complex underneath those two small office buildings?
And just so you don't think this is over soon when they shut down Dagger, they reopen in Wiesbaden-Erbenheim, about 30km north-west of their current location.
[0] https://en.wikipedia.org/wiki/Dagger_Complex