I place these reminders where they can see them: on the fridge, on doors, on mirrors, and more.
To be honest, these reminders work just as well for me too (maybe even more some days).
Sometimes that opens the door to conversations, and sometimes it doesn’t. But I trust that kids are always paying attention, even when we don’t think so.
Having these reminders in the house gives them tools and ideas they can come back to if they need them, just like the books we read.