Thanks for the drawing !
You have local (wireless) network at 192.168.0.xxx
And everything is within that local network.
The Arduino boards and the laptop are clients of the router.
Addressing the Arduino from the laptop is by addressing IP number 192.168.0.104 from the laptop.
Since it is a local network, all clients can connect to each other.
There is one small thing: If you use a static IP address of 192.168.0.104, the router must allow that. If for example the router has given that address to something else in the past, it might not accept it. You should be able to log into the router and see the clients, you should see the Arduino IP numbers there.