Pay attention to the type of processor specified (ARM7 or ARM8). If the specified processor differs from the processor of your device, the application may not install. In addition, the mod may not work at all on emulators!
Google Play services is a component that ensures the proper operation of Google services, and is also used to update Google applications and applications from Google Play. In addition, Google Play services provide the correct functioning of many functions, including authentication, synchronization of contacts, and access to the latest privacy settings.
In general, Google Play services make applications and games more convenient: in particular, faster search in offline mode, maps become more realistic. As a result, if you uninstall Google Play services, applications may stop working.