If you are using IEMs, you are not going go need this DAC: 4.4mm balanced is especially useful for headphones that need power and IEMs are not one of those.
The HiFi part of it, like "32-bit/768 Khz" is pure snake oil: You will not hear the difference between that and 16-bit/44 kHz unless the volume is at an ear damaging level. Only recording above 16-bit/44 kHz can make sense.
Another snake oil: "with a frequency range of 20 Hz to 40 kHz". Humans don't hear above 20 kHz and this number drops with age. Go to an online sine wave generator and test it out.
This may be a much cheaper alternative: audiosciencereview.com/forum/index.php?threads/fosi-audio-ds2-portable-dac-amp-review.57063/
On a similar note: audiosciencereview.com/forum/index.php?threads/topping-dx1-ii-dac-hp-amp-review.72034/