The charging port on the devices is USB-C, but I had been thinking of getting a charger that had multiple USB-A ports to (a) minimize the risk of damaging/overcharging the devices by using a port that had a lower voltage/Ampere limit (e.g., 5V/1A or 5V/2.4A) and (b) to keep the cost down (port for port, I believe USB-A is consistently cheaper than USB-C, most likely due to the potential power output).
 
I was thinking of using something like the MSTJRY 5 Port Multi USB Charger Station with adjustable dividers to keep them organized while charging at low power. The manufacturer's documents don't seem to mention any concerns with the Amperes though, just the voltage. So faster charging over USB-C might be fine, I'd just rather err on the side of caution if I don't particularly need them to charge quickly.