We prove the scattering for a defocusing nonlinear Schr\"odinger equation
with a sum of two repulsive potentials with strictly convex level surfaces,
thus providing a scattering result in a trapped setting similar to the exterior
of two strictly convex obstacles.Comment: Final version, to appear in Annales de l'Institut Fourier. arXiv
admin note: text overlap with arXiv:1609.0199
