yea there's a risk always, but i can see my car from my window, plus this 2 way remote has good range, if i press lock button, car beeps as well
n then its 2 way so if any1 will open the door, remote will start vibrating 
plus i bought the tape whose head can be removed n i always remove it so it'll be pretty useless for any1 to remove it 
as for guard, even if u'll pay they wont move around, they'll just keep sitting