Ready for the tint shop! Any advice ?

I was quoted $600 for tint installation, all windows including windshield (ceramic) + amp/sub install.

This is literally the cheapest price I found and I messaged dozens of places. Most places don't even do both tint and audio so I think I'm winning just with that alone.

Any advice? Any questions I should ask out the gate ? I'm thinking of 5 all around and 35-45 up front.