multi-site network & child themes

I'm launching a new service for clients, instead of doing individual wp sites, I've built a multi-site network & using WPMDEV themes as per this article

I'm going to use the divi theme from elegant themes as the base theme for sites.

I'd like advice on how best to configure this with child themes. Should I create a child theme for each seperate site in the multi-site network? If so, is there a quick way to do this workflow wise.