This hanger will accommodate two pairs of headphones, and has slots for Qi charging transmitter coils and boards on each side. I just attached it to the underside of my desk with a couple of Command strips.

My headphones weren't initially Qi-compatible, so I picked up a couple of receiver coil-board combos from AliExpress as well and did a bit of surgery to get them into the headband, then ran a USB pigtail cable out of the headband to the headphone's USB port. Has been working great for 9 months for me.

There is a hole in the tab on the rear of the model that I just put a bolt through, held on by a nut, to retain the transmitter boards.

There is some slight warping of the thin layer between the transmitter and headphones because I used PLA and the transmitter/receiver give off some heat while charging. If it bothers you, try a more heat-resistant material. Haven't had a problem with transmissibility despite this though; my headphones are always fully charged in the morning.

AliExpress links:

Qi transmitter: The original one I bought is no longer available, but it looks to be the same as the “15W Type C” option on this page: https://www.aliexpress.com/item/1005005785079927.html

Qi receiver: “Square coil” here: https://www.aliexpress.com/item/1005003411188792.html

USB pigtail: https://www.aliexpress.com/item/1005003298112031.html