SD-WAN project

I have 3 tplink Omada router er605, I want to connect these 3 routers together using omada sdn controller and each of them will be connected to 1 client(computer) as well multiple testing will be done on the network and will be monitored using wireshark to monitor the jitter, bandwidth, packet loss, , I have problem with configuration now as I can't connect them all together and latency, the 3 routers will act as a business that has 2 branches+1 main office. the only thing that I need is the configuration