[Question] Seoclerks API - Importing XML feed into WordPress

I am planning to create an affiliate store of Seoclerks.com using wordpress. As a first step, I try to import their XML feed into WordPress using WPAllImport plugin. But I am not able to do that successfully - I can import only one record - root. I am confused about this.

Has anyone done this import successfully? Can you detail the right steps to do this import? Thanks in advance.

You can check the Seoclerks API page at https://www.seoclerk.com/api/page/serviceads