Has anyone successfully used the USCartool A500 Crossmember?

How did you decide where, or how high, to weld the mount plate to the cross member? (The piece that the trans mount bolts to)

I know you were not asking me, but I used an empty trans case to mock in place. I had to trim a little more (where the red is), not wider but what was already cut. Pretty much just the part that touches the floorboard stays.
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