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A DNS zone apex (a.k.a. shortest private suffix, like example.com or example.co.uk) can't also appear in a CNAME record. It could appear on the left-hand-side of an A record, but it would then have to point to an IP address. Since Marketo requires that you point to a *.mktoweb.com hostname to manage their infrastructure, this isn't possible.
An alternative is to
- Paste Marketo Forms onto your main website using Embed Code
- Create custom Forms that use the API to inject leads into Marketo (or a third db that is connected).