I appreciate your concern. Clover is a girl kitty... She sees the vet two or three times a year. We got her from the rescue and she was a larger kitty then this and has been on a diet. She is and has been very active chasing her step brother and sister around our house, because she believes that she should be the only cat in he house. She doesn't like wet cat food or people food at all. It's slow going and it doesn't change the fact that she is a lot of kitty. It was about 85 in our house the day I took this picture and she flopped in the tile floor to cool off.
It amazes me that people in this thread tell me all about how I care for my cat by just looking at a picture of her.
I would set up your router, turn off ssid broadcast and forget about it. It's doubtful they have the equipment to find an access point that doesn't actively announce itself to the world .
Edit: it means you will have to manually add your wifi network to your devices by typing in the ssid on them but other than that there shouldn't be any issues