I've done a search on MFA and most comes up with Weebly are very behind the times but short of finding another platform for all my clients, thought I'd ask if there are any options available for better protecting a website access other than the lame 'site password' option that Weebly gives than enables everyone who knows the one password access to your site? My clients are asking for a MFA option which I can't give. I've had a quick google and looked for options to integrate a third party option but nothing jumping out at me. 

In this day and age of cyber security, hacking, phishing etc, are we really left with no MFA options or alternatives?