Tracking Treadmill Runs

I’ve recently acquired an old commercial treadmill to keep my running up over the impending winter. I’m running a Garmin Fenix 6, and use Zwift on my bike trainer.

I’m keen to record my data as accurately as possible (Speed, Distance, HR) whilst on the treadmill, what’s the best way to do this? Footpod? Running Pod? Or will the Fenix as accurate as those anyway?

Using zwift with treadmill would be a bonus, but not essential.

Thanks