Keyhole Holes in 4.3 Case?

I've tried a few different ways of making some mounting holes in the 4.3 case. There's not enough room between the case bottom and Pi for fully enclosed spaces without making the case another 1mm taller just to support it. I've sort of compromised and came up with these instead. What's everyone's thoughts on having open holes in the back of the case? They accept M3 or #4 pan/round screwheads.



Obviously, the HeaterMeter case isn't waterproof or even water resistant but I'm not sure how I feel about having wide open holes in everyone's case, regardless of if they are going to hang the device. Should holes be the standard HeaterMeter case, or just leave it as an option in the Thingiverse Customizer?

My vote would be for an optional case with holes that is a little taller/thicker.