This is not a “correct” usage of footer: a footer s supposed to contain some “permanent” information valid for a whole part of the document. What you are requesting is rather a kind of signature in a specifically dictated position.
Since it is a one-shot indication, I don’t recommend putting it in the footer. This is my suggestion of an auto-text or sample auxiliary utility document (so that you only need to copy and paste).
Create a frame in a dedicated empty paragraph. The frame will be anchored to this paragraph as To paragraph. Vertical position is set From top
of Entire page
(because there is no “from bottom”) and you tune the distance so that it is located where you want it to be. Horizontal position is selected according to your rules, likely to be centred.
Don’t forget to remove the border which comes by default.
Enter your information using whatever paragraph style to achieve the desired layout.
If needed, the anchoring paragraph, i.e. the one where you inserted the frame, can be reduced to need nearly no space by setting its font size to 2pt (the absolute minimum in Writer) and spacings above and below to 0. This is necessary to avoid creating an empty page with only the “signature” in some circumstances (a full last page).
Once everything ready, save for easy future use.
A few remarks:
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If you have a real footer and this “signature” is supposed to replace it, make the frame as wide as your text area and use a non-transparent background, like white, to hide the real footer.
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You can also play with the frame width and horizontal position to hide selected elements of the real footer, e.g. to keep the page number.
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You may experience some difficulty later when you try to modify the frame: it is next to impossible to select it with a mouse click because it lives outside the main text area; then temporarily reduce the bottom margin to zero, ignoring the warning, select the frame and later restore the margin.
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