I like to deploy my AT assets so that many cover the same area. Combine AT-guns, tanks and zooks/shrecks. Then when a nice portion of the enemy force has entered your killing ground you open fire with just about everything you've got. The multiple targets presented to the enemy can be very disturbing and you're practically guarateed to make quite a few kills. Also, if you pull this of, the psycological effect is tremendous. In a combind arms battle, losing your AFVs as the attacker can ruin anyones day.
If this kind of things is possible of course depends on the map and the number of AT assets at your disposal. When I get to pick my forces myself I like to spend a good portion of the points on tank killing stuff because of the reasons above.