for wireless charging, you need both the receiver/charge pad
That goes on the outside of a phone/device, (inside if the device is big enough)
And the charging station, which is usually a round puck/plate
You place the phone/device on
You can get receivers for approx $10 on Amazon
Transmitter/station/inductors range from $20 up
I would suggest staying away from up right stands designed for a specific phone device
As they may not align probably with receiver placement inside an ereader
Afaik they charge at a slower rate than a wall wort
Designed for convenient overnight use