Beautiful Mounts!
I wouldn't combine the two unless by proximity. I'm not sure I can come up with a situation that's believable. A full shoulder mount with the deer standing on a rock ledge with the cat sunning below or off to a side is as close as my mind can see the two co-existing naturally. A single quail feather stuck to the muzzle as the finishing touch.
My father in law has an awful Bobcat mount. The exposed fang look ruined it in my opinion. The rock looks like the paper mache it's made of, and the sponge paint looks at home in an elementary school art room.
