I have Pi-Hole on the network that every device in the house runs through, with extra blocklists and a year or so of manual tweaking, that covers most stuff. I also run ad block plugins just in case, don't allow commercial TV (they only watch Netflix or ABC Kids app), and that pretty much covers everything for our family.
It's also just a thing we keep in mind and work around in life. We won't use any service that has ads, or any site that finds ways around the Pi Hole, or watch shows/movies with heavy product placement, etc etc. It's just part of mine and my wife's core beliefs (privacy in general) so we just guide our kids towards "good" content and taught them from the minute they could understand, that "ads are bad, we don't like ads".