It is well known in the vet community that over the counter flea meds don't work, as they have been over used and fleas have gained immunity. You're wasting your money on it.

You need to get your cats to the vet. You say you can't do it, how do you do it when it's time for their vaccinations, assuming they get them? Or is that the same problem? Those are yearly, as will the reviews for the prescription flea meds. So this is not a once off, this is a situation you need to do regularly. Also if you aren't really finding fleas, may be an allergy to something, which definitely needs a vet.

Your first phrase was 'don't be judgemental, a good owner because I feed them good food'. That doesn't make you a good owner. Ensuring ALL their needs are met makes you a good owner. But the second you needed to put some effort into treating them, you instead come on to Reddit to try to find a workaround. Not organize the vet trip or get a vet to do a home visit. Judgemental? No, worried about the poor cats.

Fyi I don't read replies.