SHZ = vertical acquisition channel, 50 sps (samples per second)
EHE = east-west acquisition channel, 100 sps
EHN = north-easth acquisition channel, 100 sps
EHZ = vertical acquisition channel, 100 sps
With location, do you mean the floor of the building the device is on, or the geographical location?
If the first is true, then we recommend (if possible) to put the Shake on the lowest floor of the building, away from any vibrating machinery. If you meant the second instead, the elevation is important for the location algorithm to work properly, but is already taken into account with the latitude and longitude data that have been input.