The proposed anti-ship variants of the Me 410 (which is what they were rather than dedicated 'torpedo bombers') were all to be land-based aircraft. The Baltic and the Med were the intended areas of operation. Oh, and the Black Sea provided the Nazis and their allies could have held on to any of the coastal areas on that body of water.
While some kit was tested on B models, the production anti-ship aircraft was to be a version of the Me 410C.