Network strategies

I already have 1 WD Media Live hub but I am considering on setting up 2 more TV’s. Rather than 2 more WD Media Live hubs,  I thought I would try and centralize my media by getting a  3 T WD MY Book Home Network Drive and 2 WD Media Players. I guess my question is; is this better than two more Media Live Hubs? I know the manual indicates that My Media Library will track all media from all drives but I still have to Select each content source, it would be nice if it would only show up as one library.

As Long as you put all your files on the my book and I assume you can access it like a network share then all 3 devices will see the my book as a share