[Advice For Using In An Office Environment + Remote Workers]

It is quite possible that access by remote workers will work out of the box.  If not check your firewall settings - see some general tips here: http://help.getsync.com/customer/en/portal/articles/1902445-peers-aren-t-connecting?b_id=3895

 

I personally use a Synology device to do just that and it works fine.  Drobo should also do fine, but I don't have first hand experience with it.

[Syncthing To Sync 2.2?]

For personal use I run Sync on DS212 (older and less powerful than DS213) without any issues.  I have about 20 folders, ~100GB, ~100,000 files.