child bike seat integrated rear rack

I want to start a thread about Companion Bike Seats. They seem like a solid company, though their seats appear a bit overpriced. For instance, they do have an ebike spoke, but it's a $50 upgrade. Besides that, I mostly have questions about whether and how well they work. In theory, they sound...

Hi All! I think I've finally decided which ebike I want to get (the Surface604 Rook), and now need to find a kid's bike seat that can fit on it. Does anyone have anything to share about this topic? I'm having a really hard time finding out whether or not some bike seats will be able to fit on...