Mogs did it as well. I used a covered tray with a liner of lino stood up around it as she aimed for the seal every time. In fact the one time I used a normal tray she stood in front of me and wee'd up the wardrobe
I also had a table I could enclose with plastic covering and newspaper on the floor just in case....
Mogs was lovely most of the time but had a few quirks like if I was cleaning her tray would wee on the floor (again in front of me) but I did get her back in later years when I took her to the vets as she hadnt poo'd in her tray for a few days only to find she'd given in and used Ambers tray to confuse me
love
Tab