if I bring my ear really close to the bottom part of the monitor (where the grill is) I can hear a very subtle noise. 10 cm away and I can't hear it anymore. This is definitely not a thing which disturbs me. My brightness is usually between 20-30% though.

No, not at all. But my ears aren't the best either. :) I'm really happy with the monitor, the only annoying thing is that it always wants to go into power save mode despite being used, but press the button once and it's fine.

Yes, I also have the coil beeping on my device. The problem seems to be the PSU. The coil beeping goes away with a higher load on the PSU.
This can be achieved, for example, by connecting a device to the USB-C port for charging, which increases the current load.