At that age anything goes, anytime, any place. I'm concerned that they were taken too young from their mother, who normally teaches manners, but other than that expect no self discipline or brains or anything else for at least a couple of months. They are nothing but appetites attached to energy and have no concept of right and wrong, certainly not as we know it, and will no more be able to 'behave' or follow instructions than fly to the moon. Punishing them in any way is pointless as they won't connect what they've (just) done with the punishment anyway but may end up trying to outsmart the punishment or being resentful of where it came from. If you can cat-proof their room and your house otherwise, removing all things they could remotely get into or onto or under, and anything they can knock down or that could be dangerous, do it. They won't be able to jump or climb very high for a while, but keep an eye for when they do. Are you having fun yet :-)?