I couldn’t print the original model with the smaller drain holes due to first layer adhesion issues; failed three times but I should state here that I have the most difficult time with that spool of white filament. Then I realized that the tile pattern in the corner of my shower required some custom placement for the suction cups. Imported into Freecad, used the walls of the original, changed the footprint, made the drain holes bigger, and refined the suction cup holes to be based on a double ellipse shape so that the suction cup post would slide up and be retained more positively than just single diameter hole.
Used Adaptive Variable Layer Height. It’s one of my favorite slicer features!