What combo do I need?

I YOLO bought a really old cheap track car, and I’ll be testing it in 7 days. I would like to have at least some video with sound, and gps data from the trackday. I figured the cheapest and easiest way would be to use a “lap timer app” like RaceChrono or Harry’s lap timer on my phone, fixed on the roll cage, paired with a Bluetooth 10Hz GPS/GNSS receiver. What combo would you guys recommend today?

So far I’ve looked into the Garmin GLO 2 and the mentioned apps, which seems promising if I find a good support for the phone on the roll cage.

But before I pull the trigger on some parts, I want to hear what people with experience would recommend at this moment.

Requirements: - video recording - audio recording (interior) - gps data - quick & easy install - max 3-4 day delivery in Belgium