Short flange distance of mirrorless allows the use of a shift adapter between DSLR lens & body, or as Chris is doing, use a view camera like Arca Universalis or Cambo Actus.
Shorter yes, but not necessarily short, as least not as short as medium format sensor which is right up to the camera film plane.
The sensor is still recessed to some extent and then you need an adaptor to convert round to square plus the camera, plus an adaptor to drive a TSE lens if you want to. At least that was my experience.