I have a similar issue with a wind turbine close to an airstrip I made. In the real world, there is a small, domestic turbine so MSFS thinks it should place a large one.
Exclusion rectangles do not work I think,
My only solution so far is to terraform a very deep hole at the base of the turbine so it is ‘falls’ into it. This is obviously a poor solution, even if the hole is surrounded by trees to disguise it.