Sorry, I don't know the answer to that. We had a feral cat that had 3 litters at our house before we were able to trap her and have her spayed. She hung out on our front porch, though, and I can't say I ever saw her spray.
Usually, cats will spray to mark their territory. It's more common with males, though, than females.
By the way, I'd love to see pictures! I think Bengal cats are beautiful. I would never buy a cat, though, especially now that I'm working at an animal shelter. There are 1000 cats at this shelter alone! But I saw some Bengal cats at a pet expo a while ago, and they were beautiful! Lucky you to have 2 of them!