Since about mid April there are just two similar Exits making up now about 4.5% exit probability together. Located in Panama, run in the okservers.net network, AS395978 ,they don’t give up any further information about themselves.
Personally I would feel better at least having a contact or even better, knowing who is giving that much effort. Probably a MyFamily configuration should be placed as well?
https://atlas.torproject.org/#details/29C92C854E0F6652A77F3A8B231D6932993969...
https://atlas.torproject.org/#details/2CA4B2F36C2DDECFCB0B5A0D3300ED30E68E2D...
this post contains a few pints about these relay's location (more likely in Germany than Panama): http://www.hackerfactor.com/blog/index.php?/archives/762-Attacked-Over-Tor.h... https://twitter.com/nusenu_/status/861189840796344320
They are no longer at 4.5% exit prob. They make up 3.88% exit prob. as of 2017-05-26 13:00.