You know what to do.
All measurements are from the centre front of the object.
Centre of camera lens is 300mm above and 720mm distant from and directly in front.
Centre of the Octobox is 500mm in front of and 1050mm left.
Bottom of Octobox strobe bracket is 460mm above.
Centre of Softbox is 1200mm in front of and 250mm right. Bottom of Softbox strobe bracket is 620mm above.
Backdrop (a tablecloth) is immediately behind the object. By using a wide-angle lens for the shot the backdrop appears to wrap around the object.