Will This work on a multisite installation?

I can’t say from personal experience, but I have several reports that it does work.

Would you recommend your tool to solve this request (multisite)

For a test organisation I need to register participants:
1) secured access to add participants form (test personal)
2) front end edit participants data
3) Secured area/posts) for registered participants
4) Multisite for subsidiaries of test organisation

I basically need a response, if you see limitations. Indeed I will solve the job but try to avoid a dead end I cannot identify with the infos give yet.