Ok, update time...
Since I have only 3 "additional" cameras at this time (8 in the NVR's POE ports, plus 3 others), I'm using just one POE switch now. FWIW, it's this one:
TP-LINK TL-SF1008P 10/100Mbps 8-Port PoE Switch, 4 POE ports, IEEE 802.3af, 53W
So, it has 4 non-POE ports. I used one...