no alarm is 100% fool proof
unfortunatly the best method is to watch you car and what you do with it... lots of little things help
like not blaring your music and then stoping the car and getting out... a good suggestion would be to turn your music down 2 minutes before you get to your arrival place .... and also where you park.. eg near people, nearlights and for what periods of time you leave it
other then the security of yourself being close to your car... a good well known alarm and immberliser should do
if your ultra paranid tracking is a good way to go... but like i said the best security is common sense
-Ruffels