Xkrowth

Hi guys, I need a few recommendations. I need to build the CCTV system (ip cameras) of a small hotel, the hotel has a central building (reception) and 5 other buildings (rooms), the distance between each "room building" and the "central building" is more than 100m away, there are going to be several cameras on each building, those cameras are connected to a switch (every building will have a switch) and I need to connect those 5 switches to a router (central building). So, I was planning to use fiber cable (because distance is too great for ethernet cable) to connect each switch to a single router, but the problem is that, the router only has 1 SFP port, so... How could I connect all those switches in this case?, or if you guys have a better idea on how I should connect everything?... Thanks PD: I will add a picture of how I thought I should connecting everything.