Our school always encouraged internships and made it possible to fit into the curriculum.
Students are going to search online so a vacancy page is helpful.
Word-of-mouth works less well in my experience, people forget these things unless they see a specific match.
Also check if schools have those pamphlet display boards, students use them a lot. If they don’t have one, check which ones they do use (apartment buildings/gym/library/public spaces/event locations etc.