You can't have the north and south poles aligned with the sun. A planet with its axis in the plane of the ecliptic would tend to resist tide lock, and if it were to tide lock anyway, it would mean the axis had shifted up to perpendicular to the ecliptic. This is a necessary condition of tide lock if you think about it, in order to rotate so that the same side of the planet is facing the sun as it orbits, the planet has to be rotating in the same plane as its orbit.