All plugs have optimized subD topology which means you can increase the resolution as needed. This means they can be used in a subD workflow or in a non-subD workflow.
If you are using non-subD then simply give the plug a subdivision or two before inserting.
If you are using the plugs for subD modeling then a small amount of cleanup after the insert will generally be required. Usually disabling "contain" in the meshMachine pop-up options makes cleaning the surrounding topology easier and faster. (I will be releasing a video in the near future of my subD detailing workflow)
1) Install latest meshMachine addon
2) Drop the contents of the plugs folder into your meshMachine asset library which is usually is found here:
3) open meshMachine plugs library to view your plugs
For more information on the use of meshMachine and plugs please see: