I suppose you want to migrate the VMs, not the hypervisors and management.
When Converter is in P2V mode (converting powered on machines, and it can't convert powered off KVM machiines), it basically treats them like physical ones. What matters are VMs OSes distros and versions. Check them in Converter user guide or release notes.
There have been various quirks related to Linux P2V, unrelated to KVM. You may want to read the release notes and acquaint yourself with them. If your environment contains e.g. a few sets of machines (grouped by distro/version), it would be a good idea to test-convert at least one from each group to see whether everything works smoothly.
HTH,
Plamen