It appears that you are on the right track with your breed selection.  Couple things.

The CO may be too much dog if you don't have a big property and want to introduce new dogs to your place whenever you want.

Kangal - is only DA to dogs that challenge its authority. Remember they have other dogs on the job while working.

GSD & Mal - good dogs but for property protection you want something that is a deterrent just by it size and presence and still can engage.

You did not mention:

Central Asian Ovcharka - milder than CO - will engage - large dog so presence is there.  Similar to Kangal

Serbian Defense Dog - Now that is the dog you want if you can find one.

Cane Corso & Bullmastiff may also work.if you get the right one.