That does appear to be where Ford tucked the batteries for this one, this not-so-great video[1] does slide under and show them briefly. Not sure how it has two motors though, I thought the whole point of crate motors was as a drop in replacement for the existing engine (plus of course then they'd cost $7,800, before the batteries).
Sorry, I meant "seems like not such a great advertisement for DIY conversions if it completely changes the way the drivetrain works (and costs twice as much as the price of one crate motor, never mind the battery etc.)".
1: https://www.cnn.com/videos/business/2021/11/03/ford-f100-ele...