Master for Headers

We use Miro a lot to make presentations (pitch decks/trend reports/etc) for which we use a lot of slides. It would be really useful to have the option to create a master for the headers, since these never change nor move. At the minute, we created them manually and copy them to each board, but we notice they often move around when they get unlocked accidentally, giving presentations a bit of a  messy/unprofessional look.