How to install letsencrypt certificate on qnap with virtual hosts

Hi,

I have a qnap nas. I login to qnap with ip address:8085

I have web server enabled and virtual hosts


Learn.domain.com
Domain1.in
Domain2.in
www.domain1.in
Blog.domain2.in
Domain3.com

How to install letsencrypt certificate for my nas and as well all support all my virtual hosts.
Can a single certificate help.

What configuration should be done in router and qnap.

Please help in this regard.

Thanks,

Loknath.

Closing in favour of How to install letsencrypt certificate on qnap with virtual hosts