I hang mine from a top bar. I just don't feel right laying her in the bottom of the hive in a little cage. And direct release may be a little risky if the workers haven't gotten used to the new queen. If she hasn't gotten out in three days then I release her.
There are 29 subspecies of Apis mellifera ... (http://en.wikipedia.org/wiki/Bee)We don't have german bees in Germany.