The Hauppauge USB TV Tuner will work with this feature.
I have not heard a rumor of a dual tuner, but that would be the best thing to buy.
I don't see why you couldn't use 2 USB Tuners at the same time. At worst you could purchase a second and maybe a USB 3.0 hub.
Keep in mind, you need to purchase a dedicated external hard drive just for the DVR function.
Personally, I'd think about purchasing another Xbox One and another tuner (dual if available) so I can have one in the bedroom as well.
I'm still waiting on a guess for when the DVR update will happen.
Panasonic 50" Plasma 3D Smart TV
HTPC/Gaming PC (i7 860, SSD, GTX 660 Ti+), Xbox One, Xbox 360, Wii-U, Wii, N64, NES
Nokia Lumia 928 W10M