The unGlue Home Monitor software will monitor ANY device connected to your home WiFi network including any of your kids computers/laptops, your Smart TV, Xbox etc.
It won't slow down that computer but the computer needs to: 1) always be on and 2) have a WIRED connection to the home wifi network. Once you have a hard wire connection to the internet, everything should pair correctly.
If you don't have a home computer that you can always leave on, our unGlue Puck is a small device that attaches to your home router. The unGlue Puck costs $39.