How to get the multisite xml sitemap index of all sitemaps?

I have installed SmartCrawl, which from the usage guide and docs sounds like it should do this, and since the Multisite Sitemap plugin seems pretty outdated (usage guide shows very old htacess rules that are no longer used) I am not sure, how to get this done.

Should I push forward and activate both? I assumed that SmartCrawl likely had adopted the multisite sitemap index from the older plugin but maybe I am wrong?

Here are my settings in the network:

And the sitemap that I am assuming should contain indexes would be /sitemap.xml but that only shows the pages of the main site.