I saw a video the other day in an APV workshop, and the guy had a foam "egg crate" type of mat on the bench w batts laid in the channels. Lowes does not have said product. So, I present to you my very high end, technical, adaptation of the above mentioned. On a serious note I have been taping my batts to my desk to get simple readings, this solves the problem.
As a bonus here is the drawer mod.
As a bonus here is the drawer mod.