Multisite – MU-Plugins Folder Doesn't Exist

Hi, I’m just trying to install the Domain Mapping and it appears the installation instructions are for MU rather than for multi site.

I don’t have the mu-plugins folder on my server.

https://premium.wpmudev.org/project/domain-mapping/installation/

Can you please advise how to install the plugin without the mu-plugins folder?

Thank you