Following the normal healing process after breast augmentation, massage may be recommended to help prevent firmness around the implants (also called capsular contracture). While there is no evidence that massage will actually prevent contracture, it won't hurt either. Unless the massage is excessively forceful, it is unlikely to cause the implants to bottom out.
I think it is important to massage your breasts at least 2 X per day.I really think it is more important than to woory if your impalnts will bottom out.Wearing your bra and perhaps massaging upwards will lessen that possibility.