Cloudflare for SaaS: How to support customers whose domains are managed by non cloudflare dns manage

I am planning to use Cloudflare for SaaS to build a platform where my customers can point their non cloudflare managed domains to a subdomain on my cloudflare managed domain.

Example

mydomain.com on cloudflare
customer 1 subdomain - cust1.mydomain.com (on cloudflare)
customer 2 subdomain - cust2.mydomain.com (on cloudflare)

customer domains(not on cloudflare)
cust1.com should point to cust1.mydomain.com
cust2.com should point to cust2.mydomain.com

Problem here is most domain managers other then cloudflare doesn't allow a cname record for then root or apex domain. so my customer's won't be able to add
CNAME @ cust1.mydomain.com

I am told i can ask them to add a A record. But A record needs an IP address but i don't have IP address from cloudflare for these subdomains

How do i resolve this?
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