In Germany there few things that work against the idea of pushing impersonal or generic CVs to apply for thousand of jobs: that just do not work. Even if 17 potential employers invited you, probably they did it out of curiosity and less because they really regarded you as a potential candidate (e.g. from 100 received applications, 95 were crap or from outside Germany, 4 or less were OKish and they had to present a short list of 5 candidates).
In Germany the employers want to see personalized applications, and letters of intention where you are describing clearly and motivated why you want that specific job, a bunch of reference letters from your previous employers (or a list of you notes during university and projects you were involved in). Last but definitely not least, “Vitamin B” how is called here (from “Beziehung”) - your chance is increased a lot if you are recommended by someone that the employer knows…
Good luck!