Silver Blades: Plated Male could conceivably be read alone. However, it follows closely on the three novellas that came before it, and you may enjoy the story more if you read them first. As the last of a four-novella series, it will contain many spoilers for books 1-3, and I really want you to enjoy them all. 

Below is the chronological order of the Silver Blades tales. They're all short, fun reads, and you'll have time to read them all. 

SB#1 - A Duel Nature

SB#1.5 - Tete-a-tete (a short story in Silver Blades: Short Irons)

SB#2 - Prize Fight

SB#3 - Dread Handed

SB#4 - Plate Male (this book!)