True about Torus mandibularis:
Torus mandibularis is seen on the lingual surface of the mandible and it occurs above the mylohyoid line, usually opposite the bicuspid teeth.
 
Ref: Shafer's textbook of oral pathology 7th edition page 159
Present above the mylohyoid line
Present below the mylohyoid line
No definite location is there
Present at lingual surface of anterior mandible