Hi all,
i managed to find an alternate use of the card slot over the wireless charger.
Parts:
1 - Rubber band
2- Card plastic
3- SSD to mount
Refer to image: 1+2+3.jpg
Place the card plastic over the SSD and use the rubber band to hold them together (note the direction).
Refer to image: 123.jpg
Finally, slide the card plastic into the card slot and push it all the way down using both hands.
Attach the SSD to the usb plug and enjoy.
Refer to image: 4.jpg
Note that SSD occupies some height so check if your phone can actually fit on the wireless charger and can charge itself.
My S7 fits happily and the SSD actually keeps it at the proper position for charging.