Don't need to focus on the back up part, as it naturally does as you go into recovery position anyways.
Since our arms extend from shoulders, and you do a long stroke for the slice, it naturally brings the racket up chest high, ready for your move back to center of court.
Hit enough, it happens.
Forehand, I slice off SW and continental grips. Backhand, I slice off a hybrid easternforehand/continental, continental, and Eastern backhand grips.