Dakota,
The sights on the XDM are drift adjustable for windage as are the sights on the Glock, M&P and many others. I have two XDM 9's and they both shoot to point of aim at 20 yards with 124 grain bullets. The dovetails on the XDM are different than many others and may not accommodate a wide variety of sights. I don't think you will need adjustable sights.
Ken