I recently measured fan noise as 62dB @ 2 ft when in ceiling mount mode. This is fairly loud, and sadly due to the geometry of my room, the PJ is directly overhead

This was measured to the exhaust side of the PJ.
It does subside, with some attenuation from the MDF shelf it is currently placed on -- the hushbox will be here sometime next week I hope.
I can tell you that the attenuation is such that it is below the detectable level on the RS meter at my listening position, but still noticably loud.
So, you simply
must do something for noise abatement.
I agree with Huey, it is quiter in desktop mode, but still unacceptably loud!
Regards,