if your cats are scared, why not set up some little cat hidey caves around the house, toby likes that I keep 4 jackets on the dining room table chairs and he can hide under there.
try leaving some closet doors cracked so they can hide in the closets, or hang some cloth off the
sofa so they have little hiding spots.
Toby is very scared of eagles so he needs little spots where he can hide from the eagle glare.