If anyone's considering setting up multiple mns on a system in the future I HIGHLY recommend using Ubuntu 16.04 Server, rather than Desktop. Huge resources are conserved this route. On my system I was only able to run 6 instances of 8bitd through ubuntu desktop, and even then one or more mn would drop out every couple days. With ubuntu server I am now up to 8 mns, I think I could get one or 2 more going even, and I only have 8gb ram installed right now, plenty of resources left over to do other stuff. It is running 100x more stable than with ubuntu desktop, it feels like, I'd feel comfortable not checking this for weeks at a time. I'll check back in in a few days.
I can recommend a service for monitoring MN
https://uptimerobot.com/