Recommendations for a stainless steel flaring tool

I ordered the Mastercool 72475 (Thanks @toolmanmike ) and the 37 degree flare. I like the idea of connecting directly to AN fitting. It will be a lot cleaner. If I understand this correctly, I would use a AN tube sleeve and AN tube nut before the flare. Would this still be a double flare? And it should be 37 degrees?