[Zope] Multiple zope instances using the same storage

I have an unusual setup. I have 4 distinct Zope instances (4 seperate Data.fs'). Each Data.fs is identical - Data is kept in a RDBMS. I have a product I need to install that stores data in the ZODB. This data is stored in one folder. Now, I *think* I can simply mount this folder in each ZODB and serve the storage through a ZEO server - however I've never done this setup, so I want to make sure this makes sense and I'm not overlooking potential problems. This is a legacy setup that I'm not responsible for, so I'm trying to keep my footprint in this setup as small as possible. Using Zope 2.7.9. Thanks, Mark