Anker 60W PIQ 3.0 & GaN Tech Dual Port Charger, PowerPort Atom III (2 Ports)

Should be fine. Apple sells quite a few Anker power adapters themselves and markets them as suitable for charging Macs or iPhones.

Good luck with it. There really shouldn't be a problem. The current is really controlled by the iPhone itself, although with these new USB-C systems the voltage is negotiated first.