The one for that price is the basic rectangle ground mount.
I have one of their rackmount batteries and so far and it appears to be doing a good job and I haven’t had any issues with it to the point where I ordered another one. There are definitely some language barriers there listings and they don’t quite seem to understand why you aren’t happy when something isn’t the way they explained it in their listing. On the positive side it appears like once or twice a day. They will have a pretty damn good deal pop up on both eBay and Amazon for, their rackmount batteries, but it seems like there’s only a couple available so you need to be ready to buy.
As far as their misrepresentation, they list it as a rack mount battery and it is in the form of a rackmount battery, but it doesn’t come with the plates to screw it into your rack. It comes with stacking amounts, which I actually think is better, but I’d be damn nice to know what you’re getting when you order the first one.
I paid $853.00 including WA tax from Amazon for one shipped from China that looks like it will be about four week total for it to get here.
I paid $891.00 total from eBay for one from their California warehouse that was here in four days.