Recently we had to make a synagogue for one day at a hall, and we used a scaffold for the Shaliach tzibbur to be well heard by all the public.
The Scaffold was 1m x 1.5m, and I don't remember the exact height. So I was wondering what would be considered "Makom Gavoha" (3 tefachim), is it 8cm, 10cm or 12cm times 3? (24,30,36 cm respectively)
The Siman on the SH"A is 90. Look Mishna Berura S"K 5.
I think the relative "fear" of the shaliach tzibur is not to take into account, since SH"A does not mention it, and Mishna Berurah bring it in the name of "iesh mehaachaaronim shecatbu", and we follow SH"A Psakim in all matters.