LR 4 - thinking of purchasing

I currently have the Elspet litter robot. It’s my first one and got it used (but very clean) so I didn’t spend the amount it would be new. It gave me my first glimpse into robot litter boxes. I have 2 cats - male and female. I have been taking care of my friend, and next door neighbor’s, 5 cats and she had the LR 4. Talk about a difference! Hers is so much easier to empty and keep clean! She uses Tidy Cat which I can’t stand - can’t handle the scents of scented cat litter. I use Boxie and with a regular litter box and my robot box and mine do not track litter outside of the box.

Now here’s one of my questions: my male cat likes to pee at the edge of the current robot box so I’m going to assume he will with LR 4. Is there anything that will keep the pee inside the box?

The coupon on their page says it’s for $200 off. Is it really? I know it’s going to be worth the investment but it’s still a major purchase.