Adding Multiple servers in 1 GO

I would suggest you look at using NetScan to do the import. It will let you use a CSV file of devices to add, or you can use it to scan your network and auto-add devices. Documentation is at https://www.logicmonitor.com/support/creating-netscans. That would be easier than jumping into API programming.

If you do use the CSV file, I suggest fully reviewing it carefully since LM doesn't do too much error checking when importing via CSV. For example it would add new-line characters to names and properties. If you use Excel to create the CSV file, just look it over in notepad before importing. It's a lot easier to get the CSV file right the first time than bulk fixing items later.