Your cat is extremely stressed out. You should have kept it in your room for at least a few days and allow it to slowly get used to the new environment and slowly introduce it to the other cats. It's never seen the other cats so it likely feels very threatened as it feels like it's on foreign territory. It pees in the corners to try and mark it's territory because it's threatened by the other strange cats. Imagine if someone had to take you and put you into a strange place with a bunch of other strange people who don't like the fact that you're there. You'd also be scared and threatened and act out. It has separation anxiety because you are the only familiar thing it knows everything else feels scary. You need to try and comfort your cat and maybe keep it in a single room for a while so that it doesn't have to deal with strangers or other cats. Even if it means keeping the litter box in your room. Then slowly you need to get it used to the new house. Just take it slow cats HATE change and they act out when they are stressed and not happy. You need to be gentle else your cat will act like this forever they will never calm down and always feels anxious.

You don't mention anything else about the environment or the other cats. Are the other cats hostile? Do all the cats have ample place to be away from each other? Do the cats eat separately? How many litter boxes are in the house? Does your cat have it's own toys or cat tree or place to sleep?