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Using multiple ADuM6028-5BRIZ devices

I have several communications interfaces requiring cabling out of my Controller Assembly. I wanted to provide isolated power for these interfaces along with isolated data lines. I am using the ADM3053 for my CAN interface as well. There is an RS485 powered by an ADuM6028, a couple of motor position sensors powered by separate ADuM6028 devices, and potentially a couple of additional interfaces powered by yet another ADuM6028. From an FCC Class B EMI perspective, will emissions be greater with two separate ADuM6028 devices or one combined load attached to a single ADuM6020 device. I was thinking separate devices will actually end up being slightly off frequency from one another thereby reducing the actual emission peak. Does that seem reasonable? Are there additional concerns with using multiple isolated switchers on the same board?

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