Ah well actually yeah there are definitely some restrictions as far as placement goes, but other than that it's quite random, so they
won't be right near your entrance, that's true (unless it's a special prefab or something, but we're talking random traps here).
I wasn't clear enough in that what I meant was they're not in this particular instance blocking the only
path out of that part of the map. Their location is appropriately distant from your start though, yeah, as intended
But also as stated, theoretically though you could in fact be blocked in an area by one or more fully trapped corridors, they just won't be right nearby.