Depending on what Camera you want to enclose - the Bear Box does allow a steel cable - such sa Master Lock Python Cable to be used if tree screws are not applicable.
Another option is to mount them high - using a ladder.
Good luck.
JW
actually saw that on the web site you gave me. It's an arm that you can hang from a tree limb with a camera mount that hangs down from it about 3 feet. The mount swivels where you can face it straight down at an angle or a few degrees off set. The only thing that has me concerned about this is wind setting off the cam. Either way a guy would have to get up pretty high to get at that cam or bring a ladder out with him. Kind of makes it not worth taking it.