Guys:
Thanks for your expertise here. I chose the wood strips ( 3/4in plywood ) to evenly distribute the weight. The feet to the amp are just inside of the sturdy and supportive heat sinks, and I was a little afraid to leave the weight centered entirely on the top plate (although I'm sure that would have been ok too )
Also, the feet on my monos are lower so that the face plates do touch when stacked alone, maybe the feet have changed recently or mine are just adjusted lower. Anyhow seems to be ok now, not pretty but functional and hidden in my audio cave beside my regular rack.
Rob S.