Holding the M9 in the landscape / normal 'mode', and trying to focus on e.g. horizontal bars is hard. This has to do with the focussing mechanism of the M9. In those cases you need to rotate the M9 90 degrees to the portrait 'mode'. Doing this should make it a whole lot easier to get the horizontal bars in focus.
The M9 has a tripod mount point (screw) at the base, but since I have an Arca-Style bullhead this is not that handy. Fortunately, I still had a Wimberly Arca-style camera plate (P-5 Camera body plate) which fits just perfectly under the M9.