By “angle” I assume you mean the “heading” of the tag. The MDEK1001 system is not able to figure out the heading of tags, however it would be possible to implement this yourself using a digital compass and some custom application firmware.
The MDEK1001 does have an accelerometer on-board, but this is only used for improving battery life by detecting when the tag is moved. This accelerometer could be used to calculate the tag’s orientation relative to the earth’s magnetic field, but I don’t think this is what you are looking for.