How to keep outdoor cats safe from lone star tick?

I have four outdoor cats, and I’m wondering if there’s something I can do to keep them safe from the lone star tick? I can’t afford the Revolution Plus topical treatment for them, and I just put seresto collars on them, but now I’m reading online that there’s still a risk with them getting themselves caught on a branch or a fence and them not be able to breakaway the collar so now I don’t know what else I could do. Them coming indoors is also not an option, because I live with my parents, and not only do they not like the idea of bringing more animals indoors, but it’s also a pretty tight and cluttered environment indoors. If anyone has any ideas it would be very much appreciated.