Ade
Well done on the video! I have also just taken delivery of the Crossfire ebike. I have the same accessory for holding the water bottle but am not sure about the under the seat position pointing forward! I will probably end up with this solution or go for a saddle bag which facilitates a bottle eg
https://www.amazon.co.uk/Aosbos-Saddlebag-Portable-Waterproof-Cycling/dp/B01H8V00BC/ref=sr_1_4?ie=UTF8&qid=1473531742&sr=8-4&keywords=Saddle+bag+with+water+bottle
I have enjoyed my first few trips and have been surprised with how good the bike is with NO assist. Did you get one of the £40ish Go Pro look alikes? If so, is it any good? Enjoy your new bike. Keep safe!