The only advice I'd give is that, if you get a baby, that you keep she/he in the tank when the cats are around. Or that you hold on to it and walk around. My cat is somewhat interested in my young male BP.

But if you get a little bit older snake, (which I would recommend for a first snake, as hatchlings can be frustrating and picky about feeding) maybe a year or two old, the cat might be afraid of it. I know that when my large female is in her tank (though she's a bit larger than perhaps you would want to start out with), the cat will sit and watch her, and she will likewise watch the cat (The 75 gallon tank is on the ground in my office room). In the case of my female, I'd be more afraid for the cat if Isis got out of her tank. Which I think my kitty knows because whenever I take Isis out of her tank the cat bolts and hides. She can sense the danger.

Overall though, no worries. Just try to keep the cat off the lid of the enclosure, especially if it's a wire mesh top on an aquarium as those can get warped from the weight of the cat.