A few things to think about:
1. Got a mixer that can host 2 ch of modular?
2 .What piece/s of gear need to interface with the modular?
3. Will any of the outboard stuff's audio go in (level adjust line --> modular --> line) ?
4. What needs to sync and by which means (midi, tap tempo clock, ...) Which box should be the master clock ?
5. Are there any Eurorack controllers to help your live performance?