The property posX represents the current rendering output X position specified in 1/10 millimeters.

If the number is positive (200) means that the signatuire field will be placed 200 units from left edge of the page.          

Example:

posX=200

posY=-300

If the number is negative (-200) means that the signature field will be placed 200 units from right edge of the page.

Example:

posX=-200

posY=-300