In all my research most cases for standard hardware are 4u and when you try to get down to 1u or 2u you spend a lot of time/money trying to fit it. I would look into buying dedicated server like a dell r6xx series box and going from there you’d honestly save money and headache.

No blades are different they are small full compute modules that go into a large backplane chassis https://www.supermicro.com/sites/default/files/2018-11/8U_SuperBlade.png