Using a static Boom Pole
For seated interview subjects I usually put the mic on a standard mic stand, the kind that has a horizontal arm, like this:



usually I have to extend the main pole as far as it will go to get the top pole horizontal so it doesn't cut the corner of the frame.

Having the mic in front of and above the speakers mouth means that you don't get pops and sybilance from them breathing into it, and also lets you get the mic closer—the top of the frame is usually closer to the subject's head than the bottom of frame.

Another option is to get a boom pole holder - like this one:



That will be a more pricey option as you'll need to buy a C-stand to put it on