RMAN Parallel to disk using multiple channels

Oracle RDBMS 11.2.0.4 and Oracle RDBMS 12.1.0.2

Configuring RMAN to write to disk.  We are using bigfile tablespaces, the first performance tuning to tackle is using multiple channels. 

I've seen different configurations, but I'd like the simplest.  Some examples show just doing a configure device type like this;

  CONFIGURE DEVICE TYPE DISK PARALLELISM 16 BACKUP TYPE TO BACKUPSET;

Other examples add this additional configuration for each channel, so that means 16 statements like so:  (Note that MAXOPENFILES 1 is required for our dedupping device).

CONFIGURE CHANNEL 1 DEVICE TYPE DISK MAXOPENFILES 1 FORMAT   '/oracle/backups/oradb/backupset/%U';

Admittedly I am not the person doing this testing, but I'd like to encourage that our backup system be as streamlined as possible.