Biggest job 'permitted' by my town was the complete design, install & wiring/flow rate monitoring of complete fire sprinkler system for a 6 unit.

Even if "[m]ore tenants are likely to download movies that use a lamp to do something illegal", I am no more liable for one than the other.Now, if you are going to monitor your tenants network traffic and become aware of illegal activity, that changes the situation [never mind, that you would be breaching privacy law yourself].

Get yourself CCTV system and monitor it.Pay the summons, and here in NYC, there's additional penalties when you pay late.