Plugins and Multisite

I have just joined wpmudev and have a question! I am using a subdirectory multisite install. I have added my main site of that install to my wpmudev dashboard and installed Defender, WP Smush, and Hummingbird. My question is:

The plugins are activated across the network so I am assuming that I cannot add those additional subdirectory sites to my wpmudev admin area?

I can see that I can use WP Smush on the media within the subdirectory sites but I cannot run a Hummingbird test.

Probably because Hummingbird is optimizing the subdirectories based on the main directory?