Eora 3D Scanner Calibration Target Stand

I recently purchased a 3D scanner for creating STL files of scanned objects.
It is from Eora 3D, and has a calibration target made of 5.75mm acrylic with a dot pattern
printed on it for calibration of the scanner.

It is important to have the target secured upright when doing the calibration, but there is no good way to do this without something to hold the target vertically.

I designed a simple stand to fulfill this purpose. It covers 6mm by 60mm of the center bottom
of the target, but