Iphone to car speakers

[TechNova]

I did a bench test last week and was happy so I installed a Bluetooth amp and my rear 6x9 speakers.
1 amp, 2 speakers and some wire was all I needed. No seperate Bluetoogh adaptor.
The Pyle amp pairs to my phone automatically in a few seconds. It wasn't very loud until I adjusted the Bluetooth settings in the phone from earphone to speaker.
I am working on a way to hold the phone without drilling holes in my dash or bezel.