Adams heavy duty suction cup with loop can be used with straps, rope, wire, cord, etc. It is ideal for marine use and other demanding applications.
Adams giant 85mm suction cup has a weight loading of 5.5kgs (12lbs) and fixes very securely to any clean dry, slick, shiny, smooth non-porous surfaces like glass, mirrors, glossy plastic, glazed ceramic tiles, car body work etc. See:- Adams Worlds Best.