Use the PlugShare app and filter for CCS/SAE Plug. This will show a good number of Level 3 chargers along your route. You can zoom in and see where the chargers are located, most will be near shopping+food.
Best option would be to code the REx for Enabling full capacity usage of the fuel tank & Allow use of the REx anytime below 75%. Then you would be less dependent on chargers.
Although PlugShare is good, often there will be another car using the charger(s), or a charger that's not working, or some chargers have multiple plugs but only one car can charge at a time.