Little bit late :)
But I use Tronsmart 33W Dual USB Type-C Car Charger bought from Amazon, it works well, is also "approved", so I'm not afraid it will hurt my 5X
https://www.amazon.co.uk/gp/product/B0146FK3G0?tag=hawk-future-21&ascsubtag=UUacUvbUpU5647904