The tricky phrase here is “properly insulated”. My EC demands an 11mm Regupol, for instance.
On the question of lateral transmission. I believe the way boards are usually laid, there is a gap between the edge of the boards and the adjacent wall, specifically to prevent the noise transmission you mention (as well as to allow for expansion). This gap is normally concealed by a skirting board. Check with the flooring company and they will advise.
Otherwise, protect your neighbours and your new floorboards and leave your shoes at the front door. It’s as simple as that.