I've had my buzzer installed for over 2 years now - no issues.
I mounted mine up on the radiator support frame just under one of the oval holes that are punched in each side and ran the small wires hidden back to the relay.
I first had it in the fuse box, but not loud enough.
My buzzer came out of my junk box, an old 70's computer buzzer, but it was 12v so I used it.