Typical ergonomic guidelines are to place monitors so that your eyes are 2-3 inches below the top of the screen (looking down is much easier than looking up). The monitor in the photo is a 40”. Either they’re a giant, or their knees are well above desk level, or they have neck pain issues.
I find the typical monitor height guideline very uncomfortable. As a developer, I usually look at the bottom edge of the screen (terminal windows, replying to online discussion). Therefore, I place my monitor higher than recommended.
My setup has monitors on arms at a similar height, lining up their horizontal centers with my eyeline so my head position and back are neutral.