We have debated this before. Some people feel uncomfortable being seen on an electric bike for a variety of reasons. Others, me included, don't care what other people think, they are missing out because of their ignorance.Mum.. look! that man rides an electric bike!
Why want to attract (possibly unflattering) attention?
Electric bikes are versatile and fill a wide range of needs. I use mine for a 10 mile each way commute. This afternoon I completed a 1 mile swim and have run the 10 miles into work this evening, so they are hardly for invalids or the frail, they just fill a certain need. Be proud and overtly ride your ebike, don't disguise or be ashamed of these great machines.
The battery placement on the Bosch bikes looks great.