I did something very similar to gsnake I stumbled upon similar wireless charger I bought few years ago to my backup Note 2 phone at the time. Since I just switched to Galaxy S9 I was looking for something I can do wireless and this seems to feet the bill pretty well, I also bought fast charger adapter if my phone is really low but if it's "almost" charged the wireless option will keep it up
Also I like the material this charger made of, the phone just stays there and doesn't tend to move, I also don't plan to build extra support for the charger as its stays in place fairly well too!