In your bra isn't such a good idea as compressing delicate breast tissue can cause cancer in the long term. Some people have tissue round the sides as well. I use a soft pump holder from AccuChek which hooks over the centre of your bra and hangs below, it doesn't show and it is very comfortable, and fits a Veo.
The problem is you have to unhook it from above and get it out to adjust... or below if you have a top, not a dress on, that's better!