Here is my recommendation for mounting position to get the best setup. You do not need to follow it. However, by reading some of the datasheet on the sensors, here what I think the best setup.
Notice that the BME280 sensor is at the bottom. It is also perpendicular to the area it try to sense.
Not doing the above is not a big deal. You may see slight temperature offset. This can easily adjusted in DTH. I personally am interested on the optimal position for my own study.
If your charger does not allow such position, you can use this and this