The phone slot is 82.3 x 13 mm, and the centre of the charging area is located 80mm from the bottom of the phone. This was designed for a Samsung S23 Ultra with a clear ‘spigen’ brand case, but will probably work fine with any similarly sized phone.
Note: While this stand works well, I would not actually recommend this wireless charger, it is a bit flakey and keeps flashing the LED (extra metal detected warning). This might be because of the charging case I have on the phone, and maybe it will work fine without a case, but be prepared to return it if you have the same issue.
Wireless charger used:
https://www.amazon.ca/dp/B08PSNPT5J
Phone case for S23 with extra charging ring:
https://www.amazon.ca/dp/B0BJRT9SKY
The author marked this model as their own original creation.