I've got a couple of lawns that have narrow strips of grass between beds. I'm looking for something that I can block the discharge with just long enough to get through the strip. Something cheap and inexpensive! Don't have the need for a nice blocker, but may have no choice. How hard are they to install and what kind of results do you get cutting fescue, bermuda, or centipede? Are most of them interchangeable between mowers if the deck is the same size?