I'd think any motion in the lighthouse(s) would be reflected in unwanted motion in-game. The VR software will be expecting the lighthouses to be stationary.
Just to confirm this, if someone "bumps" your lighthouse stands, your entire VR world "bumps" as well. The Light house units provide the tracking and are the fixed point from which Vector3 rotations of hands and head are determined. If the lighthouse is unstable the VR is unusable and instant vomit comet.