The SSL 360° Plug-in Mixer has been designed to allow you to switch between up to 8 instances of SSL Meter plug-in. You can switch between instances from UF1 itself, from the 360° Plug-in Mixer or by simply opening the individual plug-in GUIs in the DAW.
There is a known bug whereby 360° will connect to more than 8 instances of the SSL Meter plug-in. Depending on your computer’s specification this may or may not cause performance issues. If you are having CPU issues, the first thing to check is to check the amount of SSL Meter instances as this could be the cause.