So interesting issue with mirror symmetry on the internal banshee lift fan. I put on some wings so that they were facing the same way, but when I launch the craft they flip out, and when I go back into the hangar it looks like the image below.
https://ibb.co/gy1MZfW
The other banshee fan doesn't allow stuff on the sides at all, so I assume that it just wasn't made to allow for attachment there.