How to accurately print a thin piece with a hole pattern
Use the smallest nozzle possible to get better rounded edges on holes.
Slow down the print speed to increase accuracy and prevent errors.
Print it face down against the bed if possible to reduce support requirements for overhangs and increase hole quality.
Clean the bed well, increase bed temperature, stick glue, enable brim, or add 'mouse ears' to prevent warping.
Make sure the bed is levelled properly to prevent warping and increase finish surface quality.
Use a 'stringing tester' to find the best temperature to print at so that you can prevent stringing between holes.
Enable z-hop retraction to prevent stringing and errors.
You can bore through the holes with a drill to clean them flush.