I have pretty much the same problem. I have two female cats, 10 and 6 years old.
The 6 year old has the start of kidney disease, we give her fluid theropy 3 times a week. She doesnt have any infection right now but every few days she urinates outside her litter box on a vinyl mat. I've cleaned the mat with special cleaners and every 1 to 2 days she does this again. I think may be a behavior problem because the 10 year old hisses at her every time they pass eachother. I separated them for 24 hrs, liter, food, water, and the vinyl mat was clean. I brought them back together and the next morning I got a surprise again. I'm hoping if I continue this eventually she'll catch on. Good luck with your cats hopefully we will get some advise.

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