What we are talking about is a standing or resonant wave. A wave box might work better in that application; a Vortech relies on resonance (bouncing waves off a flat surface at a specific frequency). This requires wider flow or multiple synced sources on a wide tank or simply isn't possible on a curved tank (corner or 1/2 circle - bowfront would likely work).
That being said, I'm not sure of the hydrodynamics used by a box. If it requires the wave to bounce back, even a box wouldn't work on a curved tank.