Floor mount, in wall tank?
Certainly not for residential use.
The in-walls are European design by Gerberit, which can use several brands of bowls on the mount.
If a brand isn't favored as much, it's been issues related to quality control and plugging or/rinse issues.
I like how the Kohler toilets look. But they can put a crunch in the labor budget at times.
I told the head engineer that going with the extra big flapper may be a mistake, and now they have a redesign on it.
This stuff isn't rocket science. And they still haven't fixed the lower portion of the trapway. It still takes too tight of a bend. At least American Standard could figure that one out.
If I were you, I would go ahead with the style that fits for you. It's going to work.
The Saile uses a pretty standard dual flush tower that should work pretty well.
Comparing some bowls that are dual flush