Funny you should say that......
I was literally just about to post before I saw your post. I use a couple of cases. My primary care is my karbon by oneplus but I also bought the black bumper sandstone case which has a quadlock universal might stuck on the back of it. I just put my phone in it and it still works perfectly on the 50 watt wireless charger. The universal mount pages the phone maybe 4mm away from the charger.
For the record I also use the quadlock wireless car charger mounted to the dashboard. Hopefully thieves won't realize how much the quadlock mount and wireless charging head is worth.
Picture included.......
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