It occurs to me that, depending on the traps design, if the squirrel manages to tip it over on its top, the door may automatically open, as that is how they can be designed to release the critter.
I discovered that the hard way with one of mine; it must be secured to prevent a frantic critter from escaping. Once that happens it is much harder to entice them back into it.
This trap design can be a two door trap or a one door trap. One has to move a strap from a top hook to disengage that second door which is the one used to let the animal out. I have disengaged that door so it will not open unless I engage that strap again to open it.
The trap is fairly heavy but I suppose it could be turned over. I’ll see what happens.