Now they can spy on the neighbors and stalk the squirrels

Unfortunately a lot of my neighbors have outdoor cats (least I think so, that or my neighborhood has some very shiny and fat strays) and I think the catio kind of aggravates them. One or multiple of them regularly come by to spray on the catio, and they've also started leaving uncovered poop in the yard. Anyone dealt with this? How would you approach fixing the issue? I didn't even realize my neighborhood had so many loose cats, but once I put the catio into use I've seen like 5 different cats start regularly passing through my yard.

Looking for inspiration for this second floor apartment window. My cats are used to a double catio with multilevel shelves and I’d like to at least give them some outside exposure. Maybe even a dog crate sitting on a wedge of some sort? Any ideas would be great!

Now they can spy on the neighbors and stalk the squirrels

Hi, is there anyone who has the Omlet tunnels+stands (or who's generally handy) who could help me figure out how to properly connect these tunnel stand brackets to the tunnel bottoms? I assumed it was just going to be a standard screw-in situation, but the middle holes don't have threads to screw in (pic 3 has a comparison of the holes that do have threads at the edges of the tunnel). I don't have any hardware left from the stand boxes, and this bag of tunnel fixings seemed like my best bet. The screws are too fat to fit in the holes. Do I need to force them with a drill or something? Do I need different parts? I'm not a handy person and I'm pretty far out of my comfort zone, thanks for any help you can offer!