Hi, I ordered a recumbent for myself the other day. I don't have it yet.
I bought a mirror and put it on my helmet so I can start getting used to the mirror. I don't like it. I can't see hardly anything and I have to hold my head just right to see anything useful. I like the mirror on the handle bars of my MTB better. It's more like my motorcycle.
The recumbent will have OSS, but the bars point slightly down. I'm not sure I can attach a mirror to the handle bars. The kind that goes into the end probably won't work.