Do you think you will ever want to add the solar sensor? The shade will interfere with the solar readings. If not, then don't worry about it. Btw, I wouldn't worry with the UV sensor...most folks can tell when the sun is too hot. The solar sensor is handy for people interested in solar power, gardening, etc.,. The solar sensor is also a *good* bit less expensive than the UV sensor.
Just sayin'....
Ed
Ok, I wrote the above and then looked at your photos before posting. If it was me, I'd want the ISS and anemometer down by that white fence close to the water...as far away from the house as possible. But, that's me...most of us have to compromise with our installations. Mine is mostly in the clear but the anemometer is only about 20' high....and there is a big clump of vitex growing several feet to the north of it. It is what it is but I do like the area closer to the water in your instance.