It may be helpful to have a designated thrower who can provide consistency that allows receivers to work on their technique.
Version 3 of this drill can also be a scored game:
0 Points - Offence drop
1 Point - Offence catch
1 Point - Defence block
2 Points - Defence catch
Of course you can apply these rules to any shape of cut and/or throw, so feel free to adapt the spacing & shapes to match your team. For instance, you might set up differently if you primarily play split stack or horizontal stack