We don't usually recommend asking people to allow-list upfront for multiple reasons.
First, if they bypass checking your From: domain and you don't have a strict DMARC policy (or the recipient doesn't strictly enforce DMARC) anyone who impersonates you will bypass spam and malware checks. Very dangerous for your brand!
Second, allow-listing disguises wider deliverability issues. We want the earliest warning possible about dips in deliverability, rather than what seem like "random" outbreaks.
Third, from a pure marketing standpoint, emphasizing "get ready for us to send stuff your IT classifies as spam" is questionable.
In sum, whole allow-listing is tactically useful when there'a a known issue, our take is it should not be an upfront strategy.