Please export the scene to Standalone in .orbx format, then use Standalone Studio+ 2021.1.7 to render the scene with more than 2x GPUs, and Network render:
Standalone Studio+ 2021.1.7:
https://render.otoy.com/customerdownloa ... _7_win.exe
Render-Node Studio+ 2021.1.7:
https://render.otoy.com/customerdownloa ... de_win.exe
ciao,
Beppe