Pallyndrome, you can't put spawners around the world, only way to do that is in CAW but not shore if you can upload BB there. And even if you do, still you'll have to start from new neighborhood.
You can put spawners on lots using buydebug. Simply go to buy mode, type in cheat box buydebug and look under the spawners, chose what you want and place where you want on lots. You can do that on comunity lots from edit town or again using cheats testingcheatsenabled true and then "shift+click" - build on this lot. Spawner look like a box with a circle around it, so be careful to put those circles on free area, not under the rocks, buildings etc.