Riyeko/Azalea.
Sounds like it could be feasible. I have a few questions—
Projected cost per device?
Ease of maintenance?
Would it light up in the darkness? Might be suspicious. Perhaps make it light-reactive? E.g. in the presence of light, projection goes up; otherwise, nothing. Would have to use extremely sensitive sensors.
Vanish-compatible as well as Silence-compatible?
Possible to self-destruct if handled by undesirables? Not a huge detonation, mind you, just enough to incinerate any evidence.
I'm fine with footprints and possible noises. Trained thieves should be able to cover that much.