Billow is correct.
While the rogers box, is a streaming app of sorts.. it is its own platform.
Its not ROKU or anything based like that. It is its own thing.
Even to the point, that Rogers doesnt do most of the development themselves for it.
Rogers is renting the technology from Comcast in the US. So they need to do most of the development for rogers/rogers adapt what they have already added.
Most smart TVs which you are connecting to, often can add a PLEX client.
As well as plex is castable from a device, if you have a TV you can cast to.