IM sure it could be done...But why clutter the view? The wife and I had a Organic Engines Torika tandem trike what I did was to build a custom rack that allowed us to use our Arkel TT84's and the GT35's. The GT35's mounted right behind the the wifes seat. Sorry its not a very good photo, we were camping in the woods and it was getting dark...
"When the spirits are low, when the day appears dark, when work becomes monotonous, when hope hardly seems worth having, just mount a bicycle and go out for a spin down the road, without thought on anything but the ride you are taking." - Arthur Conan Doyle