I don't see iRobot getting involve with any UV zapper company in the near future. The liability in case of malfunction could be enormous.
If a roomba malfunctions, no big deal. But if a UV zapper malfunctions and people, their skin and eyes, are exposed to a UV ray which can destroy cells, iRobot would be dragged into court along with the hospital.
Even the military is reluctant to incorporate any sort of destructive power into a robot.