Please help! Cat(s) won’t stop peeing on carpet.

I have 2 male cats, both neutered. One is about 11 and the other is about 7. Neither of them have EVER peed inside before this. Long story short, my kid was sick in the hospital for 3 days. I had someone feeding my cats but they did not clean the litter box. When I came home I discovered the cats peed in a jumpy castle/ball pit in the basement. It soaked into the carpet. I threw out the castle, cleaned the carpet with a carpet shampooer. Then sprayed angry orange. And now they’re peeing on that spot again and it’s soaked into the pad under the carpet. Replacing the carpet isn’t an option. How do I get the smell/pee out and stop them from doing this? Someone recommended natures miracle and then shampooing again and putting foil down so the cats won’t go there again but I’m scared they’ll find somewhere else to pee. And I’m mostly scared I won’t be able to get the smell out.