other then alarm system , cctv ... grille is a must ... 4 years back 6 indonesian entered my house using sliding doors ( that time there was no grille ) ... they came with parang ... since that day my house installed iron rod grille + alarm system + cctv + pedinding ( cause indonesian will use black magic ) + spot light on every angle of the house ( use timer start from 9pm till 6.30 am , it will automatically on and off by itself , follow the time already set )