DVR's and Apple TV sound

I have a 7.1 system with a marantz 5009, possibly upgrading it to anthem or emotiva.  I do most of my HT viewing watching TV (Spectrum), kindle, and Apple TV apps like Netflix, iTunes, and Hulu.  I rarely watch bluerays or even DVD's anymore as there's nowhere to rent them.  (and the last netflix blueray disk we had we had lying around for a year so we gave up renting them!)

So what are my best surround format options?   I never know what settings to use - dolby, neo, etc - as all sound pretty similar with the streaming content.  Or is it that 7.1 is basically a waste if you don't use bluerays?

Thx!