Yes, thk you all for your replies.
As long as you got httpd running, and you start php-fpm, you will be able to see the list of pools matching the number of httpd processes.
However, of course you have to configure files like php-fpm.conf,
www.conf, and create a symlink between /usr/local/httpd and /opt/rh/httpd24/root/etc/httpd.
We also create phpfpm.conf in this symlink to complete the php configuration.