Where the arrows are, I want to plant 5 Sky Pencil Hollies on each side of our patio/screened porch (10 total) for some privacy. As an after thought, to bring things together, I bought 6 more to put 3 at each corner of the house where the question marks are. Would 3 be too many? Maybe 1 at each corner would be enough. Any suggestions before I do the shovel work?