Bottom-sitting silent observation is a critical technique for acquiring ambient ocean noise and an effective approach to extending the operational time of virtual mooring. The pitch angle at which a hybrid buoy contacts the seabed is a key determinant of its post-landing stability, while the contact velocity determines whether the collision will damage the buoy. Premature adjustment of pitch angle or buoyancy will reduce the gliding distance during descent. To address this, an extreme landing strategy with an inclined bottom contact (maintaining a certain pitch angle and velocity upon bottom contact) is proposed. The minimum seabed height at which each adjustment mechanism begins to regulate was determined by analyzing the stability conditions for the inclined landing of the hybrid buoy. A sliding mode controller for the inclined landing motion and a dynamic model of the hybrid buoy were established. Preliminary validation through dynamic simulation demonstrates the feasibility and effectiveness of the proposed landing approach, providing a foundation for further experimental studies.