AWD and chains

Only in extreme conditions, say if all four tires are spinning on ice, or off roading. If you have only ONE set and must “git er done”, put them on the front more maximum bite, but I wouldn’t go driving for miles on end yadayadayadayadayadayada all the way unless the ENTIRE trip was on ice or feet of snow. Otherwise , with only one set, put them on the back if expect to do many miles of driving with them on.
My BFG all-terrain T/A have been great tires for snow and mud and driving between 4x4 episodes with no chains.