Dual Delivery without changing MX records on CentOS WHM/cPanel server?

Dual Delivery without changing MX records on CentOS WHM/cPanel server?

Hello I would like my users to give a try the zoho mail as an alternative option before moving completely. How can I set Dual Email Delivery without changing our MX records on a CentOS WHM/cPanel server? I read the info at  https://www.zoho.com/mail/help/adminconsole/configure-dual-delivery.html#alink1 but I can't see any option for WHM/cPanel neither can I see any options at "Configure Email Delivery" in my zoho mail control panel regarding dual delivery.

How can it be done?

Thank you in advance
Thomas