A wired ethernet connection would be best. Can you run an ethernet cable from your modem to your TV location? I don't know if their Wifi adaptor is proprietory or if a generic wifi to USB adaptor would work. Maybe a call or email to Channel Master tech support would answer some of your questions.
I read a couple reviews of the CM+. The worst they had to say about it was the price and the small hard drive.
http://www.wired.com/2014/03/channel-master-dvr/
My experience with streaming devices is limited but I've found I like the Roku much better than the Tivo and better than the one built into my Sony TV.
I don't know what the CM+ streaming interface is like but you compare it to your Apple TV once you get things connected.