Since this is for a business, ultimately they should also put the info on their social media pages (ex. Google maps listing, instagram)
They would look super cool/modern in my eyes if they also had a Mastodon account.
Otherwise I think the best option here might be Drupal/WordPress. It’s an open source way to build the website, and it’s used by many large corporations too. If the needs are simple, WordPress may handle it. If the needs are more complex, Drupal should get it?