I put up a tree last year and anchored it to a big piece of plywood. It seemed to work. They did not scale the tree but they did play under it and knocked off most of the decorations at the botton. I put non-breakables at the botton. Also non-edibles.

The funny thing was in Feb. of each year they go to the Vet for a checkup (more than what I do for myself most years) and the Vet found a pine needle in Miley's ear canal, left over from the Christmas tree in December! It never bothered her. Go figure.

All in all, my guys have been good with the tree, other plants and flowers. Fingers crossed.