If you get shot by an Object TD you’re usually lucky if you’re still moving. It’s frontal armor being a hefty 120mm and annoyingly sloped it’s also nice to know where you need to hit it to cause some serious damage.
If you’re looking at the front (and preferably getting the f%$k out of the way), you should be trying to hit the right or the left of the gun to get the driver or the commander, or if the Object is climbing up a hill, go for the bottom of the hull for better penetration.
On the sides you have the crew on the top of the hull, but that is only applicable if you have a good angle. The best thing to shoot would be the engine on the back of the hull, or ideally the ammo rack on the center of the sides of the hull.
From the back you have the engine in the middle, and the commander on the top right of the hull.
The ammo rack is located on the middle of the sides of the hull.