This safe is for Cat A/B and the top part is for Cat H instead of being an ammo box.
Installed it today using four 12 mm X 100 mm dynabolts. Bolted down tightly onto concrete slab. I found the safe still shakes a bit but looks like its due to the baseplate flexing; it's not rigid enough. The slenderness ratio of the safe could be a problem too; it's quite tall at 1500mm high relative to the base which is only 360mm x 360mm and it's quite heavy at over 80 kg. Could not also bolt it into the wall because there wasn't a reasonable spot on the floor which also had a stud behind it in the walk in wardrobe.
Does anyone know if the authorities will have a problem with the safe installation? Law only says it needs to be bolted down into concrete with 4 bolts of a specified size and I've done that.