Any experience using ad importer plugins?

The directory I’m building is a national farmers market directory. I’ve secured a number of domains for it that redirect to a single domain. I think the one I’ll end up making primary is https://locally-grown.org. To jump start the directory I discovered the USDA has a farmers market directory with .csv export of all 8790 farmers markets listed in their directory.

All of the ad importer plugins I’ve seen only import xml. I’ve found some online resources for converting csv or xls to xml but I’m not sure how well they work. Has anyone here gone through this process and can they share some tips on the whole process?