Mount for power switch wt 16mm clearance

This is a mount for power switch wt 16mm clearance. Multiple prints will be mounted under wall and book case shelves to turn on/off LED light strips.
I bought the 12V DC switch, comes in different color, on Amazon for $3/ea: https://www.amazon.com/gp/product/B01A8FNBPW/

Printing time with PETG filament, no brim, no support:
- Rectangle. Qty 1: 2.5 hrs, fine, 100% fill
- Rectangle. Qty 2 at the same time: 4 hrs, fine, 50% fill
- Semi-circle. Qty 1: 3.5 hrs, fine, 50% fill

The semi-circ