I suppose that tablets can see the router via WiFi connection, and that laptop with KA Lite is connected to the router either via WiFi or via Ethernet cable. In order for tablets to access KA Lite on the laptop, you have to use laptop's own IP in your network. If for example you have:
You should open the browser on your tablets and write
http://192.168.1.36:8008 in the address bar.
See this article on how to check the IP that the router (also called "Default gateway") assigned to your laptop in Windows 10:
Let us know if you managed to access KA Lite on your laptop!