Hello Drodyc.
The iframes should be constructed in your backend server for being delived to your clients.
After that, you can use them in a different sites using something like this:
<iframe src="https://mydomain.com"></iframe>
For security reasons, one browser is not going to display iframes not belonging to the domain requested.
You can control that using one specific HTTP header called 'X-Frame-Options' (see https://developer.mozilla.org/es/docs/Web/HTTP/Headers/X-Frame-Options).
So you can configure your website to allow iframes from 'mydomain.com' using this HTTP header.
X-Frame-Options: ALLOW-FROM https://mydomain.com/
This header could be controlled in your backend server o directly in your F5 with an iRule.
when HTTP_RESPONSE {
#X-Frame-Options
HTTP::header insert X-Frame-Options "ALLOW-FROM https://mydomain.com/"
}
Regards,
Dario.