Instructions on how to install foreman_ipam plugin?

Problem:
I am trying to install the Foreman plugin for external IPAM and the documentation is not very clear.

So far I have run the commands:

gem install foreman_ipam -v 0.1.0
gem install smart_proxy_ipam

But I am not sure where to go from this point.

Any tips?

Expected outcome:

External IPAM with PHPIpam integrated into foreman

Foreman and Proxy versions:

Foreman and Proxy plugin versions:

Distribution and version:

Other relevant data: