It would be much safer to install SolusVM before you move the containers especially if you are not sure what you are doing.
If you use SolusVM to move the VPS then it will move the containers and update your Master server with the new VPS. If you moved them to SolusVM with out their migrate tool you will still have to import them into the SolusVM masters database before you can manged the VPS.
Pay special attention to the flags, I would at the very least set '-r' so as not to remove the container on the source node when the process completes - that way you have a fallback just in case something goes wrong you've got a safety net.
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