some audiophiles will use LP Records as a mat
Seriously? This is nuts.
Ever look at a record? The center is thicker.
Ever look at a platter? The center is recessed.
Now why do you suppose that is?
Do I need to paint you a picture?? https://www.youtube.com/watch?v=zxj3xLDNxo0
So ya stack one record atop another, what do you think is gonna happen? Centers be touching, edge be floating. Wafting up and down. Totally unsupported. All outta kilter.
Nuttiest thing I ever heard of.