The Grove devices share the same dimensions as explained at Grove module board dimensions and https://wiki.seeedstudio.com/Grove_System/#size-of-grove.
The idea would be a base plate with screw holes, and corresponding standoffs, nuts and bolts to attach the Grove devices, and other boards like the Wio Terminal as well.
- Screw holes ø ≃2.14mm.
- Square matrix of screw holes distanced by ≃1cm to fit the 2x2cm and 4x2cm Grove devices
- Elongated holes for non-standard boards like the Wio Terminal.