Or you could contact eightstack...
I believe they have sought to "build in" or "mill in" their own solution.
Bottom plate seals to create a "plenum" to balance vacuum across all the runners.
Note the small holes (4 across the top of the pic) drilled out at the bottom of each of the runners.
Quite pretty, but I can't vouch for it.
I'm yet to use the product myself, but would consider it given the opportunity.