Even back in 2016, Leapdroid included a built-in multi-instance tool. You can clone your Android environment and run multiple game accounts simultaneously without paying for a "premium" feature.
Unlike VirtualBox or VMware, Leapdroid does not require manual configuration. It automatically enables VT-x/AMD-V if available and handles multi-core allocation seamlessly. leapdroid v1.8.0.0 download