No one on here has any idea as to the suitability of the trialists.
The 3 of them have been of National League quality or better in the past but all have been deemed not good enough for their previous clubs. That is why they are on trial.
Of the rest I would say any 11 of them as a team are not good enough for the National League. Any 5 or 6 of them put together with 5 or 6 newcomers that have experience of mens professional football, high fitness levels and a positive mindset would make a team good enough to survive and maybe even thrive in the National League.