No screws at the bottom by default. (admittedly not easy to mount). Often secured with wire-taps.
If you like screws, specify distance (and expect a few days delay). eg.

• 2 pieces of M4x15 positioned at the center, horizontally 50mm away
• If you like screws positioned non-centrally, upload a drawing, eg. create directory under MembersPage/YourName in http://www.vems.hu/wiki/index.php?page=FileArea and specify drawing URL in the order note. Drawing must be drawn looking at the back of the LCD-case, where the screws are !