I might put it somewhere like /opt/ or /usr/local/bin
Oh yeah and one more thing:
Cronie is particular about the permissions for /etc/cron.d/0hourly. None of the tasks in /etc/cron.d/{hourly,weekly,daily} … etc will be run (including the anacron launcher) if /etc/cron.d/0hourly is damaged or has improper permissions. pacman -Qkk cronie can show if you have any such issues.