Lindy,
I see these disclaimers “hidden” often on the copyright pages.
I would follow print placement. If the disclaimer is in with other information on the cover jacket material it would be helpful to add a heading to set it apart. When rule 2.7.1a states each item begins on a new braille page, that would be the front or back cover material starting on a new page, so if there was a lot of material on the jacket, it could be overlooked.
If it is not cover jacket material, then follow print placement and it would start on a new braille page. A heading would not be necessary since the new page would set it apart. Sometimes I see Disclaimer in bold.
Hope this helps,
Connie