What about the empty space between the Speedo and 8.8” entertainment lcd? There’s lots of empty black glass space for a gauge.
What is behind that "glass"? I would be surprised if it is open. If it is open that certainly would be a good place for gauges, especially since the dark glass would hide any styling differences between AR's work and the market available gauges. Don't forget, one forum member managed to crack the glass with a suction cup phone mount; it is fragile.
There doesn't seem to be a lot of blank space near the line of sight. I think FNM's pillar pod suggestion may be the best approach. Perhaps a good project for said 3d printer? I think Android Auto and a gauge app would likely work better than any other location.
One available spot in front of the driver but a bit low, is the open lower spoke of the steering wheel.
It should be noted that CAN bus gauges can be slow. Evidence has it that boost and RPM indications on the CAN bus lag the actual values by enough to make them of limited utility.