Expensive item but very practical and useful in my opinion. It also comes with a camera mount piece which I will use to attach to a "cradle box" to hold my rifle in place. Well, I have to try to make something like that and make sure it works, lol.
IMO, most of those "cradle boxes" won't likely work well with bullpups, because there's no way to attach it close to the rifle's center of gravity, and that's critical for stability. Even the Bog looks like it might not work perfectly. I tried one of the simpler types, and it was horrible, even with an expensive ballhead underneath, as the rifle shook like crazy.
I once started working on my own "extended cradle" which will connect to the rifle in 2 different spots, (ahead of and behind the trigger) and leave the trigger area open enough to shoot. while attaching to the tripod from a bar below the trigger. It should work, but I never got around to finishing it.