Thanks. It didn’t appear to overflow for me - although maybe it would have if half the water hadn’t been directly dumped on the counter lol.
Based on the pics in the manual, I had to hunt around to find a container that was a) big enough to hold 2 litres, b) small enough to balance on the drip tray and c) low enough to fit under the portafilter. Answer: no such container exists - I think it’s physically impossible. Fortunately the images in the manual were ridiculous and, as you say, most of the water is squirted into the drip tray and barely anything comes out into the container sitting on top. Silly manual!