The V1X Geophone should be mounted according to:
V10 should be mounted either on the wall or on the floor, and have the label parallel with the wall (readable from the side)
V11 should be mounted either on the wall or on the floor, and have the label parallel with the floor (readable from above)
V12 should be mounted either on the wall or on the floor, and have the label parallel with the floor (readable from above)
V12R should be mounted in the ceiling and have the label parallel with the ceiling (readable from below)
If you measure triaxial then it should be <1º to avoid false measurement.
Electrically isolated mounting
When you are mounting the V1X it is important that there is free space between the ground and the V1X housing.
Here's the V1X housing in contact with ground. This is the wrong way of mounting.