GeoIP Top Spammers or ??

Hi Folks,
I'm looking at improving some security. I was cleaning up some firewall rules and noticed some unusual activity. I noticed that there were a few IP addresses from China and another one from the Netherlands port probing. I do know that there is not much I can do to block/clear it all, but I would like to reduce their efforts.

Does the GeoIP Top Spammers help? I don't really want to block countries or big swatches of IPs. I have some stuff that other ham radio operators use.

What are your suggestions??