I want to parallel test my application on various OEM and android versions?

Genymotion Cloud lets you run multiple virtual devices in parallel for cross-testing and comparison. It supports Android images from 5.0 to the most recent versions, and you can create custom devices with different screen sizes and hardware configurations. Mobile Testing and Development Interactive Engagement

You can also automate this with CI/CD tools like Detox, CircleCI, Bitrise, or Jenkins. If you need OEM-specific device coverage, Genymotion is stronger on Android versions and device profiles than on exact branded OEM models.