Does Squirrly work on a multisite wordpress?
Short answer is YES.
Squirrly works on multi-sites / works with the Multisite version of WordPress. You need to install it at the network level for it to be accessible for all sites in the current multi-site.
It can be activated at the network level, although, each site must be optimized individually.
Does the pro version count each multisite from the total 7 in the pro plan?
Hi. Yes, the PRO plan counts each multisite.