Is Lifter Elements BeaverDash wpmu / network / multisite ready?

Yes! We do offer a separate version of Lifter Elements that includes network-wide activation: Multisite License

The Starter and Creator versions will not activate at the network level and will require activating a copy manually on each sub-site in order to receive updates. There's nothing preventing you from doing this, but we can't provide support to sub-sites as our plugin is not designed to be used this way.