We've got this 3D-printed mount designed to fit the AM14U cross brace's bottom flange holes and top row of holes. This allows us to mount the cRIO sideways.
Keeping it hollow gives us a bit of flexibility in case we have a particularly bad impact.
(obviously the real cRIO won't be zip-tied on, we just wanted to test fit it - with a "bad" 4-slot nonetheless
)