For the Astra and Vectra where the mounting hight is an issue, you need to remove the TB side of the plate. Even if you decide to keep it and let people remove it at there discretion, the hole needs to be bigger for those with a 2.4l manifold. It needs to be 66mm minimum.
Secondly, the ECU needs to be moved slightly left away from the TB as its a little too close, and more importantly, up towards the engine by 5mm or so because the wiring loom is stretched very tight to get the left hand plug on. It moght not fit if your loom is just 1mm shorter.