My church is small, and we use a non-tensioned front projection screen during the song service. Everyone can see it well, because there are only about ten pews in the room.
We have hymn books, but they don’t contain a lot of the songs that we like to sing. So, I wrote down the lyrics to several old hymns that most of the congregation is somewhat familiar with on transparency sheets, and I project them onto the screen so that everyone can sing along.
We don’t have a big fan running or anything to disturb the air very much, so the fact that the screen isn’t held taut doesn’t matter to us. It stays still unless someone bumps into it.