Motor plate questions.

I have been looking at different plates (mid and front) and have a few questions.

First I like the idea of aluminum motor plates but how would I go about attaching an aluminum plate to a steel fire wall or cage/frame?

Second, what brand plates are you folks running?
mid?
front?
or both?

Third, When running a mid plate how dose that affect the converter to crank spacig?

I like the idea of both ends of the motor solid mounted. Pros, Cons?

Thanks again for all your time and advice.