1. You just need to add a line of code to the tpl file of the page where you want to add Block number 1:
{hook h='spmmultiblocksBlock1'}
2. You just need to add a line of code to the tpl file of the page where you want to add Block number 2:
{hook h='spmmultiblocksBlock2'}
3. You just need to add a line of code to the tpl file of the page where you want to add Block number 3:
{hook h='spmmultiblocksBlock3'}