Replacement Attachable Mic Holders

Where are the mounting holes on the PA system for the microphone holders or do we need to drill the holes ourselves?

You just need to drill a hole on the side of the handle

I have a model PPHP1299WU.5. There does not appear to be any place for the mic. holders to drill into. Do we drill into the case or the handle? The extension handle will not work for us because it will stop the handle from going down. Is there a picture or diagram?

Mic holder attachment location please see attached image through the link below

https://drive.google.com/file/d/1Z441lzH3BJmmtbVhG05H6i5BdzuHbCIT/view?usp=sharing

which handles do you drill the holes for the mic holders? (the extension handle or side ones?)

The extension handles which are having ready holes for drilling.