multiple radiators

I recently got a spanking new PC with a 7900 XT and 7800X3D and eventually, down the line, I would like to water-cool them. I would want at the bare minimum a 240mm radiator for both, and ideally a 240 for the CPU and 360mm for the GPU. I don't know where I would mount the second one, however...

I have a 240mm AIO with an additional 120mm radiator added to the loop. The 240 is in front as intake and the 120 is up top as exhaust. Each time I think of which direction to run flow, the time before made more sense. Should I have it flow from pump to 120 first exhausting some heat before...