Def sounds like shitty behaviour from your neighbours.
In terms of decreasing crime I live in Oakland in a duplex. Downstairs was empty and crooks broke in and stole a bunch of stuff over several hours earlier this year. We only had a camera doorbell for our upstairs unit and I have footage of one of the crooks walking around the corner with a crowbar, seeing the camera and immediately turning around and walking away. The camera was a huge deterrent for them and I believe the only reason our upstairs didn't get broken into where we were fast asleep.
We now have cameras on every door + a floodlight in the backyard.
You could do that. The cheapest and easiest option is just to get yard signs saying that you are recording 24/7. Nest, Ring, and others sell there. There are plenty of generic ones too. If you want to use video cameras as a deterrent, you need to make sure people think you actually have them.
I sometimes see people with their cameras pretty well hidden. That's not going to work as a deterrent!
I use both strategies. I have an obvious camera on my porch pointed at my front door. I also have a camera hidden in a bush near the opposite side of the porch. Any potential troublemaker turning away from the obvious camera gives me a perfect view of their face from the hidden one.
And so you may have a different opinion of your neighbor. They share a different opinion. Some Karen's think it is shitty for you to park in front of their house on a public street.
In terms of decreasing crime I live in Oakland in a duplex. Downstairs was empty and crooks broke in and stole a bunch of stuff over several hours earlier this year. We only had a camera doorbell for our upstairs unit and I have footage of one of the crooks walking around the corner with a crowbar, seeing the camera and immediately turning around and walking away. The camera was a huge deterrent for them and I believe the only reason our upstairs didn't get broken into where we were fast asleep.
We now have cameras on every door + a floodlight in the backyard.