Thanks. I didn't put any kind of spacer on either of them -- although that might have been a good idea. The way they're done, the tops of each of them could press completely flat against the wall, except for the small space created by the hinge itself. When they're in the up position, I let the metal one lean out more at the top so that I can store all those clamps. If I had a spacer piece, I could have it vertical and still conceal the clamps.
What was important to me was to use beefy enough hinges and to tie them right into the studs. I can jump up and down on either table and nothing's coming down.