I don't know anything about dirt karts, but I would think that would be the absolute worst place to mount a braking system. The brakes generate enough heat themselves now it is shielded by that hot lump called an engine. What chassis is that?
You can move it to the other side but your kart will handle different. At least you do have the thicker rotor which dissapates the heat better than the mini lite. The brakes can mount either way on a Triton it how it's designed but it will change the setup so if you do I would put it on scales before and after to make sure your percentages are still good.