Follow up of T1241, if a salvage computer is not using the default direction (firing forwards), it will not be usable in fleet mining.
Easiest solution would be to force a salvage computer to use front firing
Another solution would be to have the ship re-align itselfs and has it salvage computer fire in the intended direction by just rotating the entire ship. I prefer this one but no idea how hard that would be to do, and if it's really worth the effort in the end.