Having Multiple NVIDIA GPUs in one System

Hi there I am trying to switch to Linux. But since most Games I play have an Anti Cheat i want to use libvrt with GPU Passthrough since the Performance loss is pretty small and a Friend uses it without any Problem. But if i want to pass my main GPU (RTX 3060 TI) to the VM I need a second GPU for my Host and because i recently got a AMD Ryzen 7 5800x without an integrated GPU i cant use it for my Host. I had an old NVIDIA GT 710 lying around. So I installed it and my installation broke. Well it was technically still usable but only one Monitor was usable and I had to set the Screenresolution manually through the /etc/default/grub File and i could not install any Driver. So I reinstalled Zorin. Now I want to know what I should do to Prevent this from happening again.
I am Sorry for any Grammar or Spelling Mistakes I am not a native Speaker.
Thank You in advance.

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