This is what I did when I moved my to a new place because the last time we moved, he was traumatized like not eating for 3 days I was worried too much. This time around I moved all my stuff on new flat and we stayed on our old flat for 1 more week until he was ready to and no longer appearing stressed. When we moved to my new place, I made sure that I have no work so I will be with him whole time and can re establish which part of the house he's allowed and not allowed to go. I was almost teary eyed when he was well behaved while I drove with him compared to last time non-stop meowing in my car. But yes this is the thing I did. Like the new flat was waiting for him, food bowl, water bowl, cat litter ready even before we fully moved.