I am probably the last person to give you advice. The reason is that I have given up having a tree. Trevor has never bothered my Christmas trees but Andy can't leave them alone. I wind up putting the decorations up higher and higher and he keeps getting them and pulling/knocking them down. One year the entire bottom half of my tree had no ornaments by Christmas Day but he kept tugging on the lights strings.

I now just have a lit garland over the archway from the living room to the dining room. No one can jump that high so it stays put. I did get a small fiber optic tree table top tree a couple of years ago and Andy has knocked it over many times but really can't hurt it. The only real problem with it is that I find some pieces of the tree in the litter box occasionally.