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Totally feel for you with the asshole neighbours situation.
In my last house we lived next door to a drunk couple who would drink every day/night, play loud music until early hours of the morning - and end up getting violent and abusive with each other and everyone else.
I knew it was going to be a nightmare when the guy was arrested for hitting the woman the first night we moved in. I thought at first he was an abusive husband - but the next week she smashed a glass ash tray on his head.
It got worse for a year, they trashed their house, had fights daily etc. I knocked on their door one night in a fit of rage, and he answered naked and totally smashed.
On a few occasions they were violent towards us - tried to barge into my house one night so I pushed him out of my doorway and he was so drunk he fell back onto the floor and split his head. We rang the cops before he could and he was arrested again.
In the end we moved - the woman got pregnant and the thought of a crying baby on top of it was too much. It felt like quitting but they owned the house and weren't going anywhere so I had to!
I'd say just document everything they do, record the noise late at night if you can, document any requests you make for them to turn down music etc. It will all help if there's ever a dispute and landlords of authorities are involved!