[Aeraaa]

Not sure what you mean, but you can just find a ridge in the game (very easy to spot one) and park your vehicles behind. Reverse slope is good if you got the range disadvantage by any means (worse accuracy long range, your guns not being able to penetrate enemy armor at long ranges, the enemy having TI and you not etc) and you should ALWAYS park your tanks behind hills the moment ATGMs start appearing on the battlefield.