Here is my solution to the DTA S60, S80 and S100 mounting dilemma.
A pair of identical rectangular brackets which slip over the each end of the ECU, and accept a M5 or M6 hex socket cap bolts which allow the brackets to be solidly mounted to your vehicle, or in my case, through a set of four M6 female to male anti vibration mounts.
I printed this in Sunlu ABS
Be sure to rotate the part to print laid flat rather than upright. Support might be needed for the bolt holes, be careful removing that upon completion.