You can do both ways depends on your time and knowledge, If you are using Dism please follow this link
http://www.admin-enclave.com/en/articles/windows/213-add-the-internet-explorer-11-to-a-windows-7-image.html
make sure you have downloaded all the prerequisite patches and integrated as per the article.
You can also use IE 11 deployment kit (Ref: https://technet.microsoft.com/en-us/itpro/internet-explorer/ie11-deploy-guide/using-ieak11-to-create-install-packages)
Thanks
Babu