If the cats are caught and Animal cControl is called to pick them up, they WILL put down the animals, as they do not have the time to try to tame them. Even friendly cats that are taken there are put down, because, they do not have the space or resources to house the thousands of animals that are brought to them. They even post in their infamous kill list, where various groups/people will try to pull them out, but in most cases there are just too many too save.
Sorry you have a problem, the best thing is try to put repellants around. Coffee Grounds, citrus scents, mothballs. Or you get close enough a spray bottle with water. They do not like to get wet.