Another thought, those Dwarf Alberta Spruce grow agonizingly slowly. It may take 10 years for them to get big enough to screen anything. Mugo Pine might be a better choice, since it stays low and shrubby but it grows faster and wider.
Mugo Pine (Pinus mugo 'Rock Island Compact')
If you could tell us where in the country/world you are, we'll be able to recommend other plants that might serve you better for the screening purpose. Fill it in on your profile, and then your location comes up in all your posts in the upper right corner.
