I wouldn't worry about the locks on the tent zippers. I realized that if they really wanted something they would just cut the tent, then the stuff would be gone and my tent would be ruined.
I brought a plastic locking trunk that stayed in my tent. The trunk was locked and it so happened that I had an opening in my tent that allowed me to lock that trunk to a tree with a cable.
Truly valuable stuff such as money, credit cards, camera, phone, etc. stayed on my person. Clothes, chairs, bedding, extension cords, etc., if somebody wanted it that bad, so be it.