If you can't work out an anemometer site and an ISS site that is within the 40 ft connection cable distance (or the distance of a reasonable cable extension), Davis also sells an anemometer transmitter that allows you to widely separate the anemometer from the ISS portion.
Most weather station set up guides say to place the ISS over grass; however, I don't feel that an artificially watered, grassy plot is representative of native conditions in a desert environment. I mounted mine over natural brushy vegetation and large boulders. In this high desert environment here, I think that location may maximize the diurnal temperature swings.
If you aren't mounting the anemometer for ET measurement, mount it as close to the standard 10m height as you can minimizing influences of nearby trees and buildings. You can always estimate a correction factor to adjust the wind speeds to the 10m standard. The closer the height is to 10m, the closer the factor is to 1X.