There's not particular right way I don't think. Do what works best for you and your wife in every setting. My husband and I are right side draws and there is no chance of bumping into each other unless we both shoot n move into each others path. Hopefully we both make space to the threat in the proper direction
Are yall cross drawing?
If you haven't taken a ccw class together, I recommend it. We got a chance to take a weekend class and it helped to see how each other performed in the same scenario. So to speak, it made us more like a regular season team instead of just a team for the all-star game :P
Train together if you can.