Panasonic KX-TGP600G Operating Instructions Manual page 177

One screw here
One screw here
WALL MOUNTING TEMPLATE
1. Drive the screws into the wall as indicated.
2. Hook the unit onto the screw heads.
Note:
Make sure to set the print size to correspond
with the size of this page. If the dimensions of
the paper output still deviate slightly from the
measurements indicated here, use the
measurements indicated here.
One screw here
One screw at either point