Possible PDF Signature Positions using Signer.Digital Library:
Use Offset to fine adjust Signature position in the required corner.
NOTES:
PDF PositionSetting has property SignaturePosition with 6 possible positions viz.
TOP_RIGHTTOP_CENTERTOP_LEFT,
BOTTOM_LEFTBOTTOM_CENTERBOTTOM_RIGHT
This diagram depicts X and Y offsets used by different signature positions. Thus, only 2 out of 4 Offset property would be used by any single position. In other words, TOP_RIGHT and BOTTOM_RIGHT positions uses Offset from Right side for convenience instead Offset from Left.
For using PDF signing methods from library, pdfSigner.SignPDF, pass PageNo as 0 (Zero) to use setting in PositionSettings.SignOnPage (possible values being EnumSignOnPage.FIRST_PAGEor EnumSignOnPage.LAST_PAGE)