octominer has 8 slot and 12 slot cases. They have the ability to provide well over 3000 watts as a few of the cases have 4 1000 watt hp servers.
Cases are certainly not an issue as long as "ASIC peripherals" stick to GPU dimensions.
Cooling might be an issue, GPUs have their own fans but ASIC hash boards don't.
An ASIC peripheral would have to solve that by having it's own cooling or rely on external cooling.