Switch which cam plus - only 2 or 3 of 7

I only need to ‘cloud’ 2 or 3 of my 7 cameras.
Can I change which ones, after buying subscription ?

Yes you can, if you keep them up to date.

/edit - for example I’ve multiple cams ~900 miles apart. I couldn’t upgrade the cam plus on a cam that was not up to the most recent Firmware. And as today shows sometimes the FW update fail.

Yes, the subscription can be assigned to any of your cameras through the services tab under account.