Give Nix SU privileges
Grant all required SuperSU Permissions  on one of the device and then connect it to desktop through USB and execute below commands .

Note: This commands will work only if adb has root access . 
          It will be good if you uncheck Re-authetication &amp; check Trust System User option also at the time of intial configuration .

adb root
adb shell
chmod 777 /data/data/eu.chainfire.supersu/shared_prefs/eu.chainfire.supersu_preferences.xml;
cat data/data/eu.chainfire.supersu/shared_prefs/eu.chainfire.supersu_preferences.xml &gt; /sdcard/eu.chainfire.supersu_preferences.xml ;
exit;
adb pull /sdcard/eu.chainfire.supersu_preferences.xml ;


For replicating above same SuperSU settings on other device, connect  device to desktop through usb and execute below commands .

adb push  ../eu.chainfire.supersu_preferences.xml /sdcard/
adb root
adb shell
chmod 777 /data/data/eu.chainfire.supersu/shared_prefs/eu.chainfire.supersu_preferences.xml;
cat /sdcard/eu.chainfire.supersu_preferences.xml &gt; data/data/eu.chainfire.supersu/shared_prefs/eu.chainfire.supersu_preferences.xml ;
am force-stop eu.chainfire.supersu;am start -a android.intent.action.MAIN -n eu.chainfire.supersu/.MainActivity ;