IMHO the tilt for these lenses is not so important. They are quite wide and wide angle lenses, when tilted, due to curvature of field,
exhibit quite a bit of lateral chromatic aberation, or color fringing which you later need to correct. DXo has some nice correction software which may help.
But because of the inherent depth of field of such short lenses you may not need the tilt. This need is increased though by the higher mp backs. You cannot stop down as far, for instance, with a P65+ or Leaf 56mp back as you can with a back around 30-33mp due to diffraction. You will lose at least a stop of depth of field and perhaps almost 2.
Rod