Which Android emulators can co-exists on single machine? Which emulators can co-exists on single Windows machine and be used simultaneously for app development (adb support)? I'm using Genymotion which seems to work on bare system; AVD x86_64 requires Intel HAXM driver; how about Microsoft emulator from Visual Studio 2015? Did anyone tried it already?

EDIT: question was clarified to emphase the simultaneous work on one machine - virtualization issues are main topic, not CPU/RAM usage
You can use as many emulators on the same machine as you want, simultaneously, at the same time, there's no actual limit, as long as you have sufficient RAM in your computer to handle that many emulators. When you want to debug an app you just choose whichever emulator you need.