There are four monitors on the wall, which is important as there will be three fights going on simultaneously.
Actually three mats is not bad. In some competitions there are four mats, which makes it super hard to follow the fights.
That said, it's not so easy. It's a constant juggle of switching your gaze from one monitor to another, hoping you will not miss any key developments. In Rio they did not offer instant replay on the monitors so I missed a lot of key developments. I really hope they have instant replay this time around!