Thank you everyone!
I think I will try getting a sheet of steel to lay on top of the plastic first.
I also contact TW directly and this was the response in case anyone is curious:
"I had to do some research on this as the dual angle fixture I had before I sold it had a heavy steel plate base...
Will creating a permanent metal platform be bad for if I still use the Lindsay templates sometimes on top of it? I was assuming the plastic was there to prevent wear on the Lindsay template from running across metal.
I have a Tom White diamond power hone and have just gotten the GRS dual angle sharpener.
I have used the GRS sharpener in the past with a GRS hone, and the magnetic post for the sharpener held well to the top of the hone.
With my Tom White hone there is a black plastic platform on the top of the...