Generally speaking, The Heights (all boys, independent Catholic) takes a very low-tech/no-tech approach--both the school itself and many of the families.
This was a welcome change from what I saw at many other schools, both public and private, where it seemed everyone jumped at any chance to get the kids in front of a screen (e.g., a 300 page PDF file instead of a history book; no algebra textbook and "all online" math homework). And that's not even getting into the lax approach to screen time that many families seem to take these days.
It's a difficult issue but finding a school where you are on the same page as the school itself and the families who send their kids there goes a long way to help.