Modo | Edge Bevel Depth Tip
This video shares a quick Edge Bevel Depth tip in Modo, to produce 90-degree notches on the edges of a mesh.
Note: if you want to be very picky... use this exact value= -241.421356237%
[ -( sqrt (2)/2)/( 1-sqrt (2)/2)* 100% = -241.421356237%]