there is a litter called Cat Attract that is supposed to work really well. I also have one that tends to pee inappropriately but she's a newcomer and it's one reason why she was returned to Siamese Rescue - the first time.
She's 98% litterbox user and then about once a week she'll pee on my stove
when I'm not home. I'm blaming her cause it's a new thing and although I fostered her during both of her returns we did recently adopt her.
But she also HATES absolutely undeniably HATES my male tabby. So when I'm home it's quite possible that he teases her when she heads for a litterbox. Zeus (male tabby) is known to do that. When I'm home I can run interference but if I'm not there I can't.
I don't blame Catnip cause I know the behaviors of Zeus so I'm pretty sure that he'll simply follow her to a litterbox and keep her from using it so she goes high and then does her business.
I did start putting aluminum foil over my stove when I'm not around and that has helped keep her off it but now I fear she'll pee on the counter instead.
Cats - mystifying creatures