Shelley,
Thank you for passing along this question, and thank you for outlining it before referring to the attachment.
A reader-friendly place to put the Nemeth Code terminator after a tactile graphic is following a blank line in cell one on a line by itself. This is in line with section 9.b under Additional Guidelines in the Guidance for Transcription Using the Nemeth Code within UEB Contexts (Approved April 2018) and also section 5.1.2 of the Guidelines and Standards for Tactile Graphics, 2010.
(As always, when an updated Tactile Graphic Guidelines that includes guidelines for transcriptions using Nemeth Code within UEB contexts is published by BANA, whatever it says overrides anything in these Ask an Expert forums.)
–Kyle