I would like to get two into each of my 7cu chest freezers. The recessed part is 24" long, so if the bases are flare down enough it may be possible to squeeze both in and leave space for the top of each fermenter lengthwise.
Already two 7.9g buckets fit in at the level of the compressor "hump" so if only one SS will fit then there will be wasted space for fermentation and would be better in a 4cu.
When I was on the site and reading the faqs the "exact-dimensions" were asked for. The reply was short, unthoughtful and disappointing and an already listed "20.5" H x 12.5" W"... which is a terrible answer.
That probably cost them some sales as the unit obviously has irregular dimensions. I'm not buying without knowing that they will fit.