For testing I usually have 4 VMs running the latest version of macOS (spread scross 2 Macs), but they are currently broken after upgrading to the latest version

For testing I usually have 4 VMs running the latest version of macOS (spread scross 2 Macs), but they are currently broken after upgrading to the latest version of macOS and Xcode. I also have a few more VMs running legacy versions of macOS for building stuff that needs to be built on older versions of macOS, but I only run them on demand. And I use a VM for collaboration (multiple people can code together and share a screen remotely on a designated VM that doesn't have any personal stuff on it). At most I probably had 6 or 7 VMs running on the Mac mini simultaneously, but if I bought a Mac Studio I'd really want to be able to run more of them. I don't want to have to quit VMs that I'm not currently using because suspend/resume always takes ages and I'm never sure if networks drives are still mounted afterwards.