This is a wall mount I made to hold a Kindle 3 keyboard (wifi version) after reading the fantastic instructable linked below to put a literature quote on the screen for each minute of the day as a unique clock.
The side cutout is to access the page turning buttons which show the source of the quote on the screen.
I used a brim and supports in the side hole with no supports in the screw holes. This can be done in cura by setting supports to everywhere and using the Support Blocking button to prevent support from clogging up the countersunk holes. You could also apply custom supports to just the side cutout.
I also used the Adaptive Layer Height setting in cura with a base of .2 which made the range of .1-.3 with mostly on the top of that range since it is a simple profile. That cut the print time estimate down from 12 to 8 hours.