Split delivery with gmail suite, MX setup

Split delivery with gmail suite, MX setup

Hi there,
We use gsuite as our primary email provider, and zoho as secondary.  Is there any documentation on how to setup both on the gsuite side and then on zoho side, step-by-step, on how to setup:
- when an email comes in for our domain, if that recipient email doesnt exist on gsuite, route the email to zoho
- How to setup/prioritize MX records for both gsuite and zoho in our DNS so there is no conflicts
- also how to setup SPF so there is no conflicts

Please let me know if there are documentation for this, thank you.