Setting “From email address”

On this page https://contactform7.com/best-practice-to-set-up-mail/ it is recommended that in the From field, use an email address that belongs to the same domain as the site.

I always set it up like this:
contactform@mydomain.com

On the same page it is also recommended to prepare a real wordpress@{your-site-domain} address on your host.

I always set up an alias email address like wordpress@mydomain.com and forward this alias to the main email address like info@mydomain.com

I have 2 questions, just to be sure I do everything good:

1 – Is it okay to use contactform@mydomain.com as the “from” address or is it even better to use wordpress@mydomain.com ?

2 – Is it okay to set up wordpress@mydomain.com as an alias? or is it better to set it up as a main email address?

Thank you for your help!