The Netbox community has launched a repository for standard devices.
https://github.com/netbox-community/devicetype-library
This comes handy for new and existing Netbox installations, because now you can populate your database with predefined device models for the most common networking gear manufacturers.
I have contributed to the repository and created the entire set of MikroTik routers and switches, updated to December 2019.
https://github.com/netbox-community/devicetype-library/tree/master/device-types/MikroTik
Feel free to use it and contribute!
And as always, you can find me on Github at https://github.com/baldoarturo