When I had Lilly, I covered the entire crate with blankets, and I also had a fleece lining in it so she was comfortable. She never once peed in her crate, which was amazing because she was sick. But, I do think the reason was because I covered the entire surface, including corners, with baby receiving blankets. Otherwise, she may have tried to go in a corner that wasn't covered. I just made sure I took her out often so she could pee, and she never had an accident, bless her little heart.
Good luck!!