TR on 1 side with ball box.1 SV which changes regularly.1 fixed passer which changes regularly -if libero present, this passer will continue to pass-.The rest will attack 52/C and MIDWith more players:
Multiple defenders.
Blocking
Instead of TR a player can pass the ball.
On the side of the TR/ player setting up the ball put an extra player who puts the attacked ball in ball box and then goes to defend.