Using only one latest post per member blog

Hi! I’d like to avoid having multiple posts show from the same site, to avoid flooding the slideshow with content from a single source. Any suggestions for how I could possibly get this to display only one post from each member blog? Basically so it shows the one most recent post from each site in the network, for whatever number of slides are set in the shortcode.

Thanks!

https://www.ads-software.com/plugins/spdm-shortcode-slider-multisite/