Tabby kittens & cats in Wausau, Wisconsin

Teagan is about 2 1/2 years old. We got her from a local rural family as a kitten. She recently started peeing on furniture. What started as a once a month has turned into a couple times a week. We have ruled out any medical issues and there seems to be some timing to a couple feral cats in our neighborhood that come through the yard and sometimes on our back deck. We have neighbors they put out food for them so they are not leaving anytime soon. I live trapped a couple of them several years ago and a local organization Feisty Felines had them spayed and neutered but they were required to release them in the same area they were live trapped. We are a retired couple with a 8 year old chocolate lab. We have cleaned and deodorized a couple of recliners that got soiled but now have to get new furniture. We have food, litter box and a cat tree to go with her. We asked the local shelter if they had someone available to foster her and solve this issue but they are booked months out.