LTC6908 Compatibility with Various Converters

I am investigating using an LTC6908 in an application with multiple power converters. In this application, it would run at a nominal frequency of 560 kHz (504 kHz to 616 kHz with spreading). I am hoping to confirm that all the converters that will be sync'd to it are able to do so -- in particular, I'm concerned about behavior with a spread spectrum clock into a converter that might, for example, have an undocumented PLL. The following converters are used in the design:


Can you confirm that all of these devices are expected to be able to synchronize to an LTC6908?