Maybe it's because a lot of Germans are renting their homes which creates insecurity for the unemployed and protects employers from such antiauthoritarian actions.
Compared to home owners that have mortgages to pay? (If you're the kind of person that can pay for a home with cash, you also can buffer a few months of rent easily)
+ German workers have a lot more protections from actual surveillance compared to many other countries (video surveillance, E-Mail and Internet monitoring, ...).
The actual implementation still depends on the company and the job, as probably everywhere. People that have to be there certain hours to be reachable by customers etc have different attitudes than people who can do their job and leave once they are done for the day, some people mind disruptions more, some people don't care or feel under-paid, ...
There's no insecurity for unemployed people. They're guaranteed to have a roof over their head paid for by the state. In fact employees usually have 6 months firing protection as well, further reducing insecurity.
