Right you lot
An anemometer should be 10 metres high to get accurate wind readings, met office recommendations

Must be positioned away from tress, buildings to stop wind turbulence.
Yeah that's in an ideal world... But you've gotta make do with what & where you can
Must remember the Davis Vue is one unit, anemometer/rain bucket/temp sensor soooooo you would need to get a happy medium.
With my setup I do have the option to adjust the height of the windy thing (anemometer) but you can't with the Vue.
Just place it in your field, get the best spot away from trees & put it at what height you thinks best
Just my 2 cents worth.