I've a Fritz Repeater and it does the job for me, it'll only create a mesh if used with a fritzbox router which I'll assume you have to be considering the Fritz Repeater. If you go for the eero mesh system that includes the eero router then make sure that if you are using a provider that uses PPPoE eero have fixed the incompatibility they had with it. If you are with Zen who are the only provider that uses the fritz box that I know of, their connections use PPPoE for authentication so the eero may not be compatible.