they seem like a no brainer to me
I'm a newbie too
most everybody say's that while they aren't a solution to the mite problem, they help somewhat.
they give you an easy way to monitor the mites by placing a sticky board or something similar under it.
they don't really cost anything, if you already have equipment just saw a hole in the bottom board leaving a 1 inch border around the edge and staple in some hardware cloth.
gives you a easy way to monitor