Yes there is!  It has taken me years and finally I can place it at the right side under the Payment  or Balance Due.  This is what I did.  Go to Gear symbol on the top right of the page.  Click on it and select

"Custom Form Styles".  Once  you are in this section look for : Name - Standard. Form Type: Master.  If you can make it the default under the down arrow on the right side then do that.  I could not.  So what I did was delete the other two invoice templates that I had forcing the Standard Master template to be the default.  Then click on edit beside the Master template.  Then click on Design.  Then : Change up the template.  Select: Airy New.  This one will give you the paid stamp in the correct place.   Good luck!  I'm pretty happy it works for me now.