My situation is the whole of my front yard is open with no fences- even between the neighbours and my place. I don't know if "trip wires" would work too well? There are also a lot of bushes/ trees on the boundary that move around in the breeze and cause shadows as the sun appears/ disappears and moves. I'm guessing a trip wire is much like motion detection and could false trigger with shadows and other changes? It is possible on the Hik's to set up different zones for motion detection and vary the sensitivity for each zone (plus completely ignore certain areas) which is what I've basically done. I do need to experiment more with the intelligent functions.
You can do this on the dahua quite easily
There is also a shadow mode for trees etc.
1 thing I have noticed as well is within a tripwire/intrusion zone you can collaborate the processing to check against ascertain size before it activates an rlarm/recording along with excluding areas which view problems.
My situation is my cameras are on the front and directly opposite I have a bus/coach company which would constantly trigger motion which using need or want to catch nor record.
By setting up collaborations and exclusion zones I cn completely remove the else alarms from them being constantly on the move
I can also set it on a schedule so on a night when they close it activates the full area for triggering motion
Works very well