hosting my radius server on the internet

Hello,

I run a company that provides hotspot services powered with mikrotik equipments including user manager as an authenticator. the question is, i plan to deploy the same service somewhere else using one authenticating gateway. someone told me mikrotik does this, that all i need to do is host my radius server on the internet and everything will be just fine. how true is this? if its true, what do i need to do.
please house, i need your expertise opinion on this one.

i will be anticipating your responses.

thanks.