Use action to move image to bottom corner?

Photoshop newbie here so please bear with me

I've just discovered actions and I had to save myself from swooning. However the one thing I really want to use actions for requires pasting a watermark then moving it to the bottom corner of the image. The images watermarked will be different widths and heights. So far I can only get it to paste at the exact point as the image which I used to record the action. Is there a setting I haven't discovered yet that will let me move it to the corner automatically?

Thanks!