Q: how do I sync my apple tv, iPad and iPhone to function seamlessly?

Welcome to the Apple community.

Could you perhaps tell us exactly what it is that you would like to do.

Well that is how it is supposed to work. Perhaps you could share the specific problems you're having now.

tt2

people who have wifi networks close to a lot of other wifi networks are advised to change their channel if they experience interferences which often manifest as poor performance.