I wanted ample clearance between the grilling grate and the closed lid of the tool box.
2 pairs of parallel holes were drilled 2" down from the top of the tool box; one pair at each end.
To position: The grilling grate is inserted into the holes at one end and pushed through. Then the other end of the grate is dropped down, inserted into the holes on the opposite side and pushed through.
The grilling grate has a clearance of 2+" so I can grill with the lid closed on most meats.
(Sorry if my instructions here are as clear as mud. Please see the pictures.)
A right angle grinder with a sanding disc was used to smooth the sharpness left from drilling.