UE 5.3.2 Ndisplay with two 4080

Hi!

I need to output 8 Full HD screens from a single program.
I chose to use “nDisplay” to output two viewports and split them into eight screens using meshes and UVs.

Currently, I have a computer with two NVIDIA 4080 GPUs.
I want each GPU to run a separate “Node” and display content on a designated screen.

I plan to use “Multi-Process Rendering”, but no matter what I do, Task Manager shows that only one GPU is running at full load, with utilization rates of 90% and 30%, respectively.

Here is the reference link I followed:
https://dev.epicgames.com/community/learning/courses/ev7/unreal-engine-multi-process-rendering/eyDY/unreal-engine-multi-process-rendering-converting-an-mgpu-config

The configuration of the two hosts is as follows:

Host_0 (127.0.0.1)
Node_0 (Primary) Graphics Adapter set to “0”
VP_0 GPU Index set to “0”
Host_1 (127.0.0.2)
Node_1 Graphics Adapter set to “1”
VP_1 GPU Index set to “1”

When I set it to:

Host_0 (127.0.0.1)
Node_0 (Primary) Graphics Adapter set to “-1”
VP_0 GPU Index set to “-1”
VP_1 GPU Index set to “-1”

Task Manager shows that both GPUs are working at 80% utilization, but the FPS does not improve.

How should I configure this correctly?
Or is there a better way to achieve this?