How to secure outlet boxes to studs when running surface mount EMT
Don't look at device boxes, which are one gang, two gang, etc.  Handy boxes are OK for a switch or etc. but not what I'd use here.   I wouldn't want plastic faceplates for shop use, even though the nylon ones are pretty durable.
You want 4x4 boxes

and raised industrial covers

The 4x4 (aka 4-square) boxes will have the holes where you want them.  You can get raised covers for a single duplex receptacle, two duplex receptacles, single round receptacles, GFCI receptacles, just about anything you want.
They look good, and they are extremely durable.