We only got started with ASF's alittle more than 2 months ago. So it hasn't been along tested process for us yet. But, we have just been using a "standard" rat rack with the Home Depot mortar mixing tubs and it has been working great. The guy we got our ASF's from had them setup the same way and didn't have much issue with chewing.
We plan to handle the chewing the same as with our rats "chewers instantly become feeders!"
Luckily we haven't had any issue with the ASF's and only had a couple rats that tried to start chewing but once they were fed off it has gone great.
We also put alot of random stuff(pieces of wood, cardboard boxes, tp and papertowel rolls) in all the tubs for them to chew on if they want so this could be helping us.