A case/holder i made for adding accelerometer to my Ender 3 Pro, using existing holes that I drilled to 1/8" to accommodate 3mm bolts.
I have a Creality linear rail, so the holes are on the back plate for that.
Made a spacer that fits between the BL touch mount and back plate.
LIS3DH bolts to the case with captive m2.5 nuts using m2.5*8mm bolts.

Print on .12 mm layer height because the lid snaps are fine in detail
I used supports for the captive nuts but have had no issues printing prototypes without supports.
Using arachne wall generation seems to do better for these smaller parts with finer details.
All of the plugs and pins are completely accessible