Use 3 perimeter wall thickness, 0.2 mm layer height, 15% infill, and no supports. Apart from that, use your printer's default settings.
The printing orientation is as provided in the file. Make sure the downloaded files are .STL. This part has been designed with a tolerance of 0.25 mm. Your printer will need to be able to bridge gaps of up to 30 mm for some designs.
For more information about printer settings, click here.
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What purpose do holes on the bottom serve? Are they also magnet holes?
Yes, the inside of the rail is where you can add magnets if you wish