“My Iiyama 4K monitor has one of those annoying HDMI Sockets that points downwards, as well as being recessed, so I have a short extension cable atached to the monitor's HDMI socket, which makes it easier to swap use between my various RPis. These official Micro-HDMI cables are more flexible than many other commercial HDMI cables, which are more like sticking a Pi on a pole. I recommend them, and I have not had any problems with 4K use.”