Big Red Car here. Ahh, the sun is shining. It is cool and refreshing. All is good in the ATX. On Earth as it is in Texas!
We just spoke of the Anonymous Company Survey deciding that was a good thing.
Now we speak of the Anonymous Board Survey being a similarly good thing.
Here is the link to an exemplar for your use.
It was configured originally as a “form fill” form and you will want to adapt it to whatever format you desire (e.g. Survey Monkey).
Take a look at it and see if can work for you. An Anonymous Board Survey?