I bought this one, it works great, but it didn’t come with an AC adapter so I have one on order.

RAVPower Galaxy S8 Fast Wireless Chargers 2 Coils QI Wireless Charging Pad Quick Charge for Samsung S8 Plus S7 S7 Edge S6 and All Qi-Enabled Devices https://www.amazon.com/dp/B074QK9XKL/ref=cm_sw_r_cp_api_usAeAbR3M3ZNS

I also ordered a second charger that does come with an AC adapter. I haven’t received it yet, so can’t tell you how it works. Seneo iPhone X Wireless Charger, Fast Wireless Charger Stand (Upgraded with QC 3.0 Adapter) for Samsung Galaxy Note 8 S8 Plus S7 Edge S7 S6 Edge Plus Note 5, Standard Charge for iPhone X 8 8 Plus https://www.amazon.com/dp/B01N1WRNOB/ref=cm_sw_r_cp_api_suAeAbBCBEEYT