I'm running exits since about 9 months. Have been running non exits for over a decade before. The exits are run by a non-profit (a Swiss Verein) and use the recommended setup like described in the blog post. The ISP knows it's an exit, it has a page on port 80 describing it and a PTR record that contains tor-exit.
No contact with the police till now.
If you would like to support the Tor network but don't want to run nodes yourself you can donate to one of the relay associations https://community.torproject.org/relay/community-resources/r...