View attachment 144383
Not the best of pictures but this is 190mm battery on a factory battery plate. As you can make out from the image, the terminals are pretty much level with the seat base top.
There’s probably like 1-2cm of free space in real life but I would consider anything coming over the seat base being at the risk zone. Higher batteries are usually mounted on their side.
Also factory installation has a rubber cover going on top of entire battery, that’s probably there to further reduce the risk of terminals getting into a contact with seat base mechanics.