Gray area here. If the two buildings are taken together as a single family dwelling unit, there is probably no problem. If they are seen as rental property or separate dwellings, then you have a possible problem. Are there other cabins next to these or is this a family compound? Are the two cabins joined in any way structurally like with a common porch or deck? You could always have the install done for one cabin with both receivers located there and then run a cable from the sat LNB to the other cabin. Or do the install yourself and avoid questions.