I used to have Nessus installed on a NUC that I would just drop into a customer's network closet for a weekend, and monitor remotely. I hosted the Nessus UI as

I used to have Nessus installed on a NUC that I would just drop into a customer's network closet for a weekend, and monitor remotely. I hosted the Nessus UI as a Tor Hidden Service, and it worked great. We just cycled the key every quarter for added security, and so that ex-employees wouldn't know where to find it.