So far, Wally is the most wary and has claimed under the bed as his zone, though he does come out to sniff around from time to time and has offered head butts. Haven't been able to get a photo of him though.
Eva was the bravest and seemed the least bothered by the transition. She sniffed and explored, drank some water, and took her place on top of her cat tree. She's come down a few times to wrestle with Red.
Red is basically a giant ham. He's only stopped exploring to rub on me and give cuddles. He's very talkative and demands belly scratches.
My only concern is that Red seems to be a little rough with Eva. So we will wait and see how well they get along once Wally adjusts more and can play more with Red.