ATEM Mini Bolt down stands
These are the 2nd version of the ATEM mini stands. These are bolt down when you want more surface space for stability or to bolt into a slotted rack mount shelf.
Available in a flat, just to get the ATEM about 10mm off the surface and allow better convection airflow, or at an angle for what some say better comfort.
They have a 6.25mm (1/4″) hole on each end 125mm apart C-C (technically the drawing says 125.002mm)
If you have access to a 3d printer, the files are posted on Thingiverse for personal use