The base stations have a motor in them and do "wobble". I put them on corner shelves which I set up specifically for the purpose in a room, and if I don't take them down of an evening, the vibration is enough to wobble them off the shelves over time (which is irritating).
The only way to really mount them securely is either on tripods, or to the wall with the brackets. May well be that. I've not noticed the wobble in the Vive visuals as such, but I do notice that the lighthouses wobble by virtue of them continually throwing themselves to the floor of a night. If you pick one up, you can easily feel it vibrate.