Can my roku ultra be used instead of the Cox Cable mini service top box .most other cable providers even provide an app you can download called spectrum.which has much nicer inter face,cable guid,and many useful tools.either way how should I connect

Yes it supposed to stay powered but the remote is programmed to also turn off my widescreens tv.so my TV off button on the bottom is hard to reach  from the way I mounted it,so  is the electricle plug for the tv.but the electric plug for the box is lower down so it's easier to unplug it when I loose the remotes.the tv will shut off after a few minutes of inactivity...wish the box had an off button ato least