From the point of view of SEO, should the promo site and the SaaS CRM cabinet be done on different domains or on the same one?

Question

Search Engine Optimization

There is a promo site with a description of our CRM.
There are personal user accounts.
I have a suspicion that due to behavioral factors (customers constantly sit on the site, return every day, click) it makes sense to make a personal account and a promo site on the same domain.
Or will it not work?

Answer 1

on one
another thing is that it doesn't always work out technically