Fully parametric design. Fusion file included as well as 3 objects with some typical hole spacings:
See the screenshot for parameters you can tweak in the model.
The holes are sized to self tap an M3 screw, but that's also a parameter you can change if desired.
No supports needed. Print with whatever settings work for you. Recommend rectilinear infill at no more than 15%.
The author marked this model as their own original creation.