Pressure stove

What would be the best method of installing a load cell into a small box? The box is made of aluminum sheet metal and is big enough to hold the load cell. What is the best way to install the load cell in the box?

Depends on the load cell and the box !
Screws and nuts I guess

Make sure that the load cell rests on solid grounds that does not flex. Maybe the ALU-box should be supported in order not to bend.