I'd recommend using managed devices as opposed to using dumb media converters. If there are issues, you have no insight into the issues with unmanaged devices.
A 'dumb' media converter is a little bit cheaper but there's no way of knowing if the failure is due to the cable, the media converter on either end, or what. Without physically inspecting it, that is.
All fine for something inside your house but not something where you have a remote location.