I have three kids, now just turning adult. My wife and I took the point of view that we are modeling a healthy lifestyle for our children. So, we only used technology as tools -- looking up stuff, scheduling, reading PDFs, etc.... AND we made sure they could see what we were doing -- no "hidden" screens or hidden computer time.
After doing this for the last 15+ years, I think it's turned out well. The oldest two seem to have a healthy relationship with their devices (as tools) and are just as happy to put them down and go outside or spend time with other people. The youngest is similar, but still needs to use tech a lot for his studies (by curriculum design). However, he'd also prefer to go outside or watch a movie than be on a device.