We want a single wifi network, not AP mode, but will it still be slow if we create a separate wifi network for the guest network and cameras? Why is there a mesh system if I have to use AP mode?

I have 3 ax53 routers, I connected 2 ax53 satellite routers to 1 ax53 main router with ethernet backhaul but I cannot get the performance I want, 2.4 ghz is very unstable I can get a maximum speed of...