Waterstones exclusives shipping

Hi, I was just wondering if anyone knew if Waterstones ships to the US and if you order different preorders at the same time do they ship separately as they release or do they all ship together.

Also is there usually limits to how many you can purchase of one book? Like could I order 2, one for me and one for a friend together to save on shipping? Would that result in one being cancelled or would they ship both even if it was a signed exclusive.

Thanks so much!!!